RSS in everything and everything in RSS
You can personalize it with your RSS feeds and photos. It supports MSN web search, tracks local weather and integrates with Hotmail and MSN Messenger presence. I like the slick, minimalist UI. Well, duh it's a screensaver.
Also noticed the folks behind Start.com have been working hard. The site has a much improved interface. Check out the search. Hmm, RSS? Ship it already!