This list represents the methods as of 0.4 Beta.  I will be adding many more and some may be subject to change.  Contact me if you have any questions about any particular method.

QBXMLVersion

XMLVersion

openLocalConnection

openRemoteConnection

isLocalConnectionSupported

isRemoteConnectionSupported

closeConnection

beginSession

endSession

getCurrentCompanyFileName

unlockRuntime

ARRefundCreditCardAdd

ARRefundCreditCardQuery

AccountAdd

AccountMod

AccountQuery

AgingReportQuery

AlertAdd

AlertDel

AlertQuery

BillAdd

BillMod

BillPaymentCheckAdd

BillPaymentCheckMod

BillPaymentCheckQuery

BillPaymentCreditCardAdd

BillPaymentCreditCardQuery

BillQuery

BillToPayQuery

BillingRateAdd

BillingRateQuery

BudgetSummaryReportQuery

BuildAssemblyAdd

BuildAssemblyMod

BuildAssemblyQuery

ChargeAdd

ChargeMod

ChargeQuery

CheckAdd

CheckMod

CheckQuery

ClassAdd

ClassQuery

ClearedStatusMod

CompanyActivityQuery

CompanyQuery

CreditCardChargeAdd

CreditCardChargeMod

CreditCardChargeQuery

CreditCardCreditAdd

CreditCardCreditMod

CreditCardCreditQuery

CreditMemoAdd

CreditMemoMod

CreditMemoQuery

CustomDetailReportQuery

CustomSummaryReportQuery

CustomerAdd

CustomerMod

CustomerMsgAdd

CustomerMsgQuery

CustomerQuery

CustomerTypeAdd

CustomerTypeQuery

DataEventRecoveryInfoDel

DataEventRecoveryInfoQuery

DataEventSubscriptionAdd

DataEventSubscriptionQuery

DataExtAdd

DataExtDefAdd

DataExtDefDel

DataExtDefMod

DataExtDefQuery

DataExtDel

DataExtMod

DateDrivenTermsAdd

DateDrivenTermsQuery

DepositAdd

DepositMod

DepositQuery

EmployeeAdd

EmployeeDefaultMod

EmployeeDefaultQuery

EmployeeMod

EmployeeQuery

EntityQuery

EstimateAdd

EstimateMod

EstimateQuery

GeneralDetailReportQuery

GeneralSummaryReportQuery

HostQuery

InventoryAdjustmentAdd

InventoryAdjustmentQuery

InvoiceAdd

InvoiceMod

InvoiceQuery

ItemAssembliesCanBuildQuery

ItemDiscountAdd

ItemDiscountMod

ItemDiscountQuery

ItemFixedAssetAdd

ItemFixedAssetMod

ItemFixedAssetQuery

ItemGroupAdd

ItemGroupMod

ItemGroupQuery

ItemInventoryAdd

ItemInventoryAssemblyAdd

ItemInventoryAssemblyMod

ItemInventoryAssemblyQuery

ItemInventoryMod

ItemInventoryQuery

ItemNonInventoryAdd

ItemNonInventoryMod

ItemNonInventoryQuery

ItemOtherChargeAdd

ItemOtherChargeMod

ItemOtherChargeQuery

ItemPaymentAdd

ItemPaymentMod

ItemPaymentQuery

ItemQuery

ItemReceiptAdd

ItemReceiptMod

ItemReceiptQuery

ItemSalesTaxAdd

ItemSalesTaxGroupAdd

ItemSalesTaxGroupMod

ItemSalesTaxGroupQuery

ItemSalesTaxMod

ItemSalesTaxQuery

ItemServiceAdd

ItemServiceMod

ItemServiceQuery

ItemSubtotalAdd

ItemSubtotalMod

ItemSubtotalQuery

JobReportQuery

JobTypeAdd

JobTypeQuery

JournalEntryAdd

JournalEntryMod

JournalEntryQuery

ListDel

ListDeletedQuery

ListDisplayAdd

ListDisplayMod

ListMerge

OtherNameAdd

OtherNameMod

OtherNameQuery

PaycheckQuery

PaymentMethodAdd

PaymentMethodQuery

PayrollDetailReportQuery

PayrollItemAdditionAdd

PayrollItemAdditionMod

PayrollItemCompanyContributionAdd

PayrollItemCompanyContributionMod

PayrollItemDeductionAdd

PayrollItemDeductionMod

PayrollItemDirectDepositAdd

PayrollItemDirectDepositMod

PayrollItemNonWageQuery

PayrollItemQuery

PayrollItemTaxAdd

PayrollItemTaxMod

PayrollItemWageAdd

PayrollItemWageMod

PayrollItemWageQuery

PayrollItemWorkersCompensationAdd

PayrollItemWorkersCompensationMod

PayrollLiabilityAdjustmentAdd

PayrollLiabilityAdjustmentQuery

PayrollLiabilityCheckQuery

PayrollPriorPaymentAdd

PayrollPriorPaymentQuery

PayrollSummaryReportQuery

PayrollYearToDateAdjustmentAdd

PayrollYearToDateAdjustmentQuery

PreferencesQuery

PriceLevelAdd

PriceLevelMod

PriceLevelQuery

PurchaseOrderAdd

PurchaseOrderMod

PurchaseOrderQuery

QBCommandExec

ReceivePaymentAdd

ReceivePaymentMod

ReceivePaymentQuery

ReceivePaymentToDepositQuery

SalesOrderAdd

SalesOrderMod

SalesOrderQuery

SalesReceiptAdd

SalesReceiptMod

SalesReceiptQuery

SalesRepAdd

SalesRepMod

SalesRepQuery

SalesTaxCodeAdd

SalesTaxCodeQuery

SalesTaxPaymentCheckQuery

ShipMethodAdd

ShipMethodQuery

SpecialAccountAdd

SpecialItemAdd

StandardTermsAdd

StandardTermsQuery

SubscriptionDel

TemplateQuery

TermsQuery

TimeReportQuery

TimeTrackingAdd

TimeTrackingMod

TimeTrackingQuery

ToDoAdd

ToDoQuery

TransactionQuery

TxnDel

TxnDeletedQuery

TxnDisplayAdd

TxnDisplayMod

TxnVoid

UIEventSubscriptionAdd

UIEventSubscriptionQuery

UIExtensionSubscriptionAdd

UIExtensionSubscriptionQuery

UnitOfMeasureSetAdd

UnitOfMeasureSetQuery

VehicleAdd

VehicleMileageAdd

VehicleMileageQuery

VehicleMod

VehicleQuery

VendorAdd

VendorCreditAdd

VendorCreditQuery

VendorMod

VendorQuery

VendorTypeAdd

VendorTypeQuery

WorkersCompCodeAdd

WorkersCompCodeMod

WorkersCompCodeQuery

XML_APAccountRef

XML_ARAccountRef

XML_AccountFilter

XML_AccountRef

XML_Address

XML_AlertPermission

XML_AppliedToTxnAdd

XML_AppliedToTxnMod

XML_ApplyCheckToTxnAdd

XML_ApplyCheckToTxnMod

XML_Argument

XML_AssetAccountRef

XML_BankAccountRef

XML_BaseUnit

XML_BillAddress

XML_BillingRatePerItem

XML_BillingRateRef

XML_COGSAccountRef

XML_COMCallbackInfo

XML_CashBackInfoAdd

XML_CashBackInfoMod

XML_ClassRef

XML_CompanyFileEventSubscription

XML_CreditCardAccountRef

XML_CreditCardInfo

XML_CreditCardTxnInfo

XML_CreditCardTxnInfoMod

XML_CreditCardTxnInputInfo

XML_CreditCardTxnInputInfoMod

XML_CreditCardTxnResultInfo

XML_CreditCardTxnResultInfoMod

XML_CreditMemoLineAdd

XML_CreditMemoLineGroupAdd

XML_CreditMemoLineGroupMod

XML_CreditMemoLineMod

XML_CustomerMsgRef

XML_CustomerRef

XML_CustomerSalesTaxCodeRef

XML_CustomerTypeRef

XML_DataExt

XML_DefaultUnit

XML_DeletedDateRangeFilter

XML_DepositLineAdd

XML_DepositLineMod

XML_DepositToAccountRef

XML_DiscountAccountRef

XML_DiscountLineAdd

XML_DisplayCondition

XML_Earnings

XML_EmployeeAddress

XML_EmployeeDefaultPayrollInfoMod

XML_EmployeeDirectDepositAccount

XML_EmployeePayrollInfo

XML_EmployeePayrollInfoMod

XML_EmployeeRef

XML_EmployeeTax

XML_EmployeeTaxInfo

XML_EntityFilter

XML_EntityRef

XML_EstimateLineAdd

XML_EstimateLineGroupAdd

XML_EstimateLineGroupMod

XML_EstimateLineMod

XML_ExpenseAccountRef

XML_ExpenseLineAdd

XML_ExpenseLineMod

XML_FixedAssetSalesInfo

XML_FixedAssetSalesInfoMod

XML_HTTPCallbackInfo

XML_IncludeListMetaData

XML_IncomeAccountRef

XML_InventoryAdjustmentLineAdd

XML_InvoiceLineAdd

XML_InvoiceLineGroupAdd

XML_InvoiceLineGroupMod

XML_InvoiceLineMod

XML_ItemFilter

XML_ItemGroupLine

XML_ItemGroupLineAdd

XML_ItemGroupLineMod

XML_ItemGroupRef

XML_ItemInventoryAssemblyLine

XML_ItemInventoryAssemblyRef

XML_ItemInventoryRef

XML_ItemLineAdd

XML_ItemLineMod

XML_ItemPurchaseTaxRef

XML_ItemRef

XML_ItemSalesTaxRef

XML_ItemServiceRef

XML_JobTypeRef

XML_JournalCreditLine

XML_JournalDebitLine

XML_JournalLineMod

XML_LiabilityAccountRef

XML_LiabilityPaymentSchedule

XML_LinkToTxn

XML_ListEventSubscription

XML_ListObjRef

XML_MenuExtensionSubscription

XML_MenuItem

XML_MergeFrom

XML_MergeTo

XML_ModifiedDateRangeFilter

XML_NameFilter

XML_NameRangeFilter

XML_NonEarnings

XML_OtherAccountRef

XML_OtherNameAddress

XML_OverrideItemAccountRef

XML_OverrideUOMSetRef

XML_ParentRef

XML_PayScheduleRef

XML_PayeeEntityRef

XML_PaymentMethodRef

XML_PaymentTemplateRef

XML_PayrollDateRangeFilter

XML_PayrollItemNonWageRef

XML_PayrollItemRef

XML_PayrollItemTaxRef

XML_PayrollItemWageRef

XML_PayrollLiabilityAdjustmentLineAdd

XML_PayrollPriorPaymentLineAdd

XML_PayrollYearToDateAdjustmentLineAdd

XML_PrefVendorRef

XML_PreferredPaymentMethodRef

XML_PriceLevelPerItem

XML_PriceLevelRef

XML_PurchaseOrderLineAdd

XML_PurchaseOrderLineGroupAdd

XML_PurchaseOrderLineGroupMod

XML_PurchaseOrderLineMod

XML_PurchaseTaxCodeRef

XML_QuantityAdjustment

XML_RateChange

XML_RateEntry

XML_RefNumberFilter

XML_RefNumberRangeFilter

XML_RefundAppliedToTxnAdd

XML_RefundFromAccountRef

XML_RelatedUnit

XML_ReportAccountFilter

XML_ReportClassFilter

XML_ReportEntityFilter

XML_ReportItemFilter

XML_ReportModifiedDateRangeFilter

XML_ReportPeriod

XML_ReportTxnTypeFilter

XML_SalesAndPurchase

XML_SalesAndPurchaseMod

XML_SalesOrPurchase

XML_SalesOrPurchaseMod

XML_SalesOrderLineAdd

XML_SalesOrderLineGroupAdd

XML_SalesOrderLineGroupMod

XML_SalesOrderLineMod

XML_SalesReceiptLineAdd

XML_SalesReceiptLineGroupAdd

XML_SalesReceiptLineGroupMod

XML_SalesReceiptLineMod

XML_SalesRepEntityRef

XML_SalesRepRef

XML_SalesTaxCodeRef

XML_SalesTaxLineAdd

XML_SetCredit

XML_ShipAddress

XML_ShipMethodRef

XML_ShipToEntityRef

XML_ShippingLineAdd

XML_SickHours

XML_SickHoursDefault

XML_Submenu

XML_TaxInfo

XML_TaxVendorRef

XML_Taxability

XML_TemplateRef

XML_TermsRef

XML_TimeTrackingEntityFilter

XML_TotalBalanceFilter

XML_TransactionAccountFilter

XML_TransactionClassFilter

XML_TransactionDateRangeFilter

XML_TransactionEntityFilter

XML_TransactionItemFilter

XML_TransactionModifiedDateRangeFilter

XML_TransactionTypeFilter

XML_TxnDateRangeFilter

XML_TxnEventSubscription

XML_TxnLineDetail

XML_UnitOfMeasureSetRef

XML_VacationHours

XML_VacationHoursDefault

XML_ValueAdjustment

XML_VehicleRef

XML_VendorAddress

XML_VendorRef

XML_VendorTypeRef

XML_WorkersCompCodeRef