Reader David Beach alerted me about Chirp.com which offers a cool little screensaver application. Once you have downloaded and installed the software, you can add your accounts for Flickr, Twitter, and Facebook. Then once the screensaver kicks in you are treated to a nice slideshow that provides updates from your friends photos, statuses, and tweets from each of the services.
You can also interact with the items by clicking and dragging them, commenting on items, and more. You can get more details on these features from a post on their blog.
I played with it for a while and it makes for a nice little addition to your screensaver repertoire.