New Google Notebook API

Not exactly sure when this API quietly launched, but Google has a Notebook Data API for their Google Notebook application. It's another GData-based API, Google's XML-based protocol that extends Atom and RSS. There are now 6 GData APIs, all of which are listed here at ProgrammableWeb along with mashups built with them:

John Musser

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[...] New Google Notebook API Not exactly sure when this API quietly launched, but Google has a Notebook Data API for their Google Notebook application. (tags: google api webdev) [...]

How about a GMail API (which goes beyond the POP3 support which looks primitive by 2007 standards)? When is that coming?

Good question. There hasn't been a lot of news coming from the big players on the email API front. Despite earlier rumors regarding a few of them (Yahoo! being another).