Just a quick note. Check out Zimbra's spec for ALE.
Its like OLE (Object Linking and Embedding in the Microsoft Office World-- the technology that allows you to embed excel docs in a word doc, etc.) Only ALE uses iframes that are ALE-enabled that can load ALE-aware components.
The applications for this are for richer blogs, wikis and personalized pages. It also seems applicable to apps like Writely to incorporate. Also it could be used in lieu of badges on blogs, allowing rich interaction to be embedded in a blog page.
I like the move to componentize functionality in the front end and make the back end service oriented. Makes for a clean architecture.
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