Paul Graham's talk from [http://www.paulgraham.com/arcll1.html|the "Arc at 3 Weeks"] notes. There's nothing like a room full of gleeful nerds. (His voice is like a cross between [http://www.livejournal.com/users/glowing_fish/|Glowing Fish]'s and [http://imdb.com/name/nm0001022/|Garth Elgar]'s.)