We'll try to have recent versions of as many Linux distributions as possible, certainly including S.u.S.E 8.0 (and perhaps 8.1 if it's out) and Debian Woody. I hope we'll have the latest version of FreeBSD and (if you have networking on your machine) OpenBSD or NetBSD. I understand very recent versions of Mandrake and even Red Hat will also be available.
Please come and help, or bring your machine along.
Please, please back up your machine before you bring it, unless you are absolutely willing to risk losing everything on it!