Matt Webb has a nice idea on managing feeds.

Here's a feature I want from my RSS feeder. Every so often it should silently hide one of the feeds. If I notice, and if I remember what it was is that's been hidden, I should be able to say: Hey, you forgot feed X, give it back!, and the application would say: Okay then, you got me banged to rights, here it is. If I don't notice or can't remember, the feed is deleted permanently.