I've seen CoverItLive used here and there with mixed results, but I really enjoyed how Greg Bedard of the Milwaukee Journal-Sentinel used it in covering the Packers-Titans preseason game tonight.
Bedard started with typical posts reflecting game action, then opened it up to reader questions at halftime, then closed with a Tweet and a joke.
I didn't wade through the 257 reader comments below the CoverItLive viewer, but found Bedard's work more than enough. It was fun and conversational yet authoritative and informative. Can't beat that these days.