If you're an sf reader, you should check it out, even, or especially, if you never thought you were interested in cons. Potlatch is a bunch of thoughtful, very intelligent, very well and widely read people talking about books and ideas. See for yourself with these notes on some previous Potlatch discussions.
One event I'm excited about is a panel on "Smart Mobs and Civil Polity," whose ringleader is Cory Doctorow, and which concerns issues discussed in Howard Rheingold's book Smart Mobs, and more. Panelists include sf writer Rudy Rucker, and yours truly.
Hope to see you there!