I just joined uwebd yesterday and I've seen a few blog posts and discussions about Higher Ed Twitter lists.
Like this great one from Karlyn: http://karlynmorissette.karlyn.me/2009/01/master-higher-ed-twitter-...
And this response to Karlyn's post by Mike: http://highedwebtech.com/author/mike/
Anyway, just wanted to share with you all a pretty simple system one of our interns developed for college twitter users. She started a college student pbwiki. You can find it here: http://collegetweetup.pbwiki.com/
It's great because the wiki is organized by school, so people tweeting from the same university can make connections with one another. Anyway, just wanted to share and figured posting on here would be easier than commenting on everyone's blogs.