After about 45 minutes or so of #gno I felt like I was over-tweeting and I stopped participating. I still watching because I was interested in the topics of press and product reviews, but did other things on the side.
I was thinking it would be fun to host a twitter party... but there's that whole over-tweeting feeling again and I don't want to mess that all up. Maybe with a targeted account like you mentioned it wouldn't be a bad thing ... hmm lots to think about.