Today Google released Google Data APIs (Beta).
The technology is written for advanced coders, but what they are really trying to get two way communications. They are taking the best of RSS 2.0 and ATOM 1.0 and making a new protocol called GData.
Google favors ATOM, which by the general public is the less popular option.
…it’s useful to be able to send a query to a server and receive a response containing a list of matching results. Neither Atom nor RSS provides a way to do that, but GData does.
It is pretty obvious that they are going for a digital convergence betwen their programs like Google Calendar and RSS readers. It will certainly be something to keep up on and what develops from it. I’m sure Dave Winer (creator of RSS and OPML) will have a few choice words about it.