... without having the downsides.
Intense Debate could be beautiful, if it didn't have a couple of serious weaknesses - the separate registration process, and the sense that Comment Ownership is ceded from your blog to Intense Debate.
No doubt one day ID & WP will be more closely integrated. In the meantime, it would be good to have a plugin that picked up the one feature that's missing in WPMu:
- Reputation Points & Comment Voting
There isn't anything out there that does Rep+Comment rating - or is there?
( like http://wordpress.org/extend/plugins/comment-rating/ for Mu)