We've created a Twitter feed for conference info, updates and impressions. See it at http://twitter.com/IASSIST2009 or there's a link on the program page.
Before the conference, it will be mostly logistic and planning information. At the conference, IASSISTers will be tweeting about the conference itself: comments, suggestions, updates, and other twitter-friendly information.
We've got a few volunteer tweeters but more are always welcome.