The Alien Swarm was a definite favourite, I have found that it always works well at LANs due to the ability to scream at peoples incompetence.
The UT2004 matches, especially those on the smaller maps and with the InstaGib were highly amusing, I must remember to get the mini-gun instagib on the FTP for next time
The ridiculous amount of time people, including myself, spent trying to complete some of the challenges on Trackmania, that one has got to come back next time.
With a few obvious exception (damn you Steam authing) most people were able to join in most games and I think the nicest aspect of the weekend was that no-one turned there noses up at a game, they just installed it and played it regardless and I think we introduced a few people to a wider range of games than they were previously used to.
We are getting there in terms of the organisation and the Gamers Agreement seems to be holding true.
CD