How easy would it be to have an RSS feed of someone's individual contributions across Metafilter? There are a couple of members whose work is consistently good and might be worth watching as you would an individual blog.
Pony: at the end of the new "MetaFilter users near this user" query slap an "order by miles ascending". Not a big deal. I just want to stalk people in order, s'all. (That's a pretty damned sweet feature, btw).
Danger, Matt Haughey! Danger! Danger!