Using the Tasks gadget
Use the Tasks gadget to keep your "to do" list handy.
To open the Tasks gadget:
In Gmail, click Tasks in the left pane:
In Google Calendar, click the Tasks calendar under My Calendars:
To add a task to your list:
Click the "plus" (+) icon, or simply click in the Tasks window and start typing.
Tip: You can also add email messages to the list to create items for follow-up! First, select the messages in your inbox. Then, on the More actions menu, choose Add to Tasks.
To format your list and create additional lists:
On the Actions menu, you'll find options to indent or move items, edit details such as a due date, print your list, and more.
Click the arrow ( > ) to the right of the current task to go directly to the Edit Details screen, where you can enter a due date.
Use the Switch List menu in the lower right to rename the list and create more lists.
To work in a separate, bigger window:
Click the Pop-out arrow in the upper-right corner.
To get reminders for task due dates on your calendar:
On your Google Calendar, make sure the Tasks calendar is selected (highlighted with a color) under My Calendars:
If you want to turn off reminders at any time, just click the Tasks calendar in the list to de-select it