As you may have seen on many other blogs, MS has posted "Microsoft Feeds API" documentation on MSDN. Actually, it was included in the Vista December CTP SDK, but that's another matter.
Anyway, here's a screen shot of an app that I threw together during an excruciatingly long meeting yesterday.
The API works really well other than deleting feeds. I haven't quite figured out how to do that without throwing an exception.
Tony