http://www.blackcatgames.com/swarm

If you have UT2004, download this now. It's a co-op alien bug shoot-em-up that is done extremely well. It has a SP campaign for those with crappy internet connection and, of course, has MP support. After running though just the tutorial I was hooked. It's 110 megs and most of the mirrors are quite slow, but the torrent has some good speed behind it. Enjoy.

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"She turned me into a newt!"
Pause
"Well I got better..."