For reference, If we've tempted you to try Linux:

Mandrake: www.linux-mandrake.com
RedHat: www.redhat.com
SuSE: www.suse.com
Debian: www.debian.com

There's loads more out there, including several distros that are targetted for specific functions: firewall, router etc. and distros that fit on a single floppy disk so you can take them round with you to repair broken Windows [and Linux, but hey - Linux never breaks!!]