Vista Beta 2 ships with some standard Sidebar Gadgets, one of which is the RSS Gadget which is shown here:

I'm running Office 12 and managing my feeds in Outlook via the new RSS Feed integration.  Because Outlook uses the new RSS Feed Store in Vista, the same feeds that I add in Outlook also show up in my IE7 RSS Feed reader.  This Gadget also hooks in to the feed store and allows me to display any one of my feeds in the sidebar. 

Like it!