Looks like they were only distributing 60000 keys total, and they're all gone now:
http://community.enemyterritory.com/
Oh well. Guess I'll have to wait for the actual game to be released. I've been looking forward to this one; I love Battlefield 2 (actually I play Project Reality mod for better strategic/tactical squad based games) but the graphics are getting dated and more importantly the engine has always been kinda crappy.
id software has always been the best at making silky smooth engines w/ excellent netcode, and the gameplay on the one looks like mad fun.
nomad_delta