Two new features: resolved question sidebar (and feed) and RSS feeds for the Popular favorites page. All is explained within. [more inside]
It would be cool to have RSS feeds on a per user basis. I'm thinking mainly posts but comments would be fine too. Something like http://www.metafilter.com/username.mefi/user/posts.rss and http://www.metafilter.com/username.mefi/user/comments.rss. It'd be a great way to keep up with people whose stuff you enjoy (like everyone's favorite) w/o getting lost in the volume.