You know normally this is the kind of thing I'd hear from RoudyBob.NET, but since Bob is on a Blogging Hiatus, I guess someone still needs to mention cool new uses of RSS.
Get local weather information served up as RSS from rssweather.com
Custom eBay searches delivered via RSS from rssauction.com. Now that is just cool!
And a few more all from Glen Scales' Exchange Development Blog:
Exchange Calendar RSS feed
Exchange Public Folder RSS feed
Exchange Message Tracking Logs RSS feed
I just love to see cool new uses of great techology.