RSSFeed will be (once I get around to actually writing the code) a CachedPlugin that will (surprise, surprise!) grab an RSS feed and print out the appropriate content and links.
Even though I am currently using NetNewsWire Lite and FeedReader to grab my news, this is a useful thing for many people (and something I could use myself for some "morning coffee" feeds).
It also poses some interesting issues, such as how to graft scheduled back-end actions on to PhpWiki and the proper way to go about caching data.