Some notes on a possible interop api. This ties into a few links:

http://www.vidog.com/blog/?p=19

My original call to arms.

I think Chris has got some good ideas...I'll add a few. Feel free to add to the list.

• Single sign on and Identity management, using an open standard
• Ability to list and select resources from other services (Maybe using OPML)
• Ability to easily import documents from one service, and embed them in another, even if the imported document is not publicly published to the world.
• All the while keeping in mind that the user experience must be easy and seamless
• For UI, I think the ability to ship over bits of authenticated UI would be nice...this is a very web thing, right? I mean, we already have the standard for that, (X)HTML + JavaScript. So, it would be great to be able to actually grab a chunk of someone else's UI (which would call back to their server, etc) to do the embedding above.