The application I built for the telegraph developer weekend (which won second prize) is live on the internet.
Feedshaver is an application written in symfony that utilizes Reuters OpenCalais service to automatically tag RSS feeds and allow you to follow only certain subjects in a feed (or all of the feeds in the system). Eventually, I intend on adding feed groups, the ability to opt out of subjects instead of opt in and many other things, but for now, a slightly tidied version of the app I built in 4 hours is live. Hopefully, it'll be of use to someone.
Oh, I might even get a design for it, too.