I made the jump and installed Disqus on this site. The comment sync went very fast. I was hoping with the facebook and twitter integration I’d get more registered commenter’s, that’s not the case yet. The only real issue I had with the migration was I had turned off my local askimet plugin. When I did that I started getting spam comment and trackbacks that didn’t show up in Disqus, but I was getting notified by wordpress of the comments and trackbacks I had in its local moderation. I never got a good reason why this happened. I just enabled the local Askimet plug-in and I don’t see these anymore.
I also added the social toolbar Wibiya it adds a small bar to the bottom of the web browser that includes facebook, twitter, and flickr integration, flash games, a search bar. They are working on adding Google connect. I like the small bar at the bottom better than adding a bunch more sidebar widgets.
Give me some feedback, do you like Disqus and Wibiya? Are they working for you?