Interesting post from Robert Scoble explaining how he and a couple of friends organised a party in under 30 hours using only Twitter. Although the example is social it started me thinking whether there wasn't a more serious role for Twitter in the context of trade shows or conferences.
Why couldn't the technology be used to organise ad hoc groups of like-minded people who just want to meet up to talk about things which they are interested in? This could happen the night before, or in and around the event. As facilitator of this extra value, the organiser should reap some real rewards of kudos if nothing else.