I've never been much a LinkedIn maven. I suspect I'm like most people and I keep adding people to my LinkedIn network, but I never really use it for anything. But I got an InMail from Eric Aarts today that made me think I need to start poking my nose into LinkedIn (and Plaxo for that matter) a little more. It turns out you can post events on LinkedIn, and people can indicate whether they are going or not. I suppose you can then use that information to set up meetings and so on.
Eric pointed out that TEC 09 is on LinkedIn now. You can check it out here.