Been a Linux (ab)user since about 1997. There's a reason
I scored as the 'Nerd King God'.
Here at the house I have four PC's each with Linux as the
only OS. Two other PC's dual boot into W95, but Linux
is the primary. If only I could get rid of Quicken! :/
I'm running Debian (my current fav), Mandrake and RedHat
and a hacked up (not-CRacked) version of the smoothwall firewall.
One of these days I'll switch over to the IPCop project.
For a 'live-CD' distro I regularly use Knoppix-STD (Security Tools
Distribution). I actually prefer the earlier beta version (with KDE)
not the current v0.1 release (with Fluxbox).
My office laptop is Debian and W2K. I support more Linux servers
(Debian & RH) than Sun Solaris these days- I don't have enough
fingers to count'em all.
I've also been known to virtualize a machine or three, using VMWare
or User Mode Linux.