Hm, that seems like overkill. If I wanted to manage a feed of blogs, I'd use an RSS reader. And there will always be a default set of blogs shown to non-logged-in users and users who haven't modified their preferences (though, maybe this could be aggregated somehow based on the users who did modify their preferences?)

Have you thought about soliciting Less Wrong users for feature ideas for you to implement, by the way? Think I've got a list of features I was considering implementing myself somewhere on my hard drive... I'd expect some features to be 10x or more as valuable as others, so figuring out which features to work on seems like a good use of time.