iLife 06, Photocasting, and photos.case.edu
I installed iLife 06 on my Mac today. The first new feature I tried was the "photocasting" subscription support in iPhoto. It works beautifully with the photos.case.edu RSS feeds - photos, titles, and descriptions all display correctly in iPhoto. Just select File > Subscribe to Photocast, and then paste the feed URI (such as http://photos.case.edu/photos/all/rss) into the text field that appears.
You can use the photocast as the source for a screensaver, just as with any other iPhoto album. I'm not sure if the photos are updated when iPhoto is not running, though.