Oh lord, lets see.
Home made core2 duo CPU @ 3ghz 3GB ram, running 64 bit Fedora 15 feeding a 52" Sony 3D led TV, used to have XP on it.
Home made core2 duo CPU @ 2.8ghz 4GB ram, running 64 bit Win7 with two lcd monitors.
Toshiba laptop given to me by a friend, now running 32 bit Fedora 14.
Older Win XP machine, using some spare CPU I had, running XP. Used for guitar effects.
Old P3 multi processor machine with 2 1Ghz CPUs. Mostly retired, but I'll be dusting it off to do slide scans in the near future.
Viewsonic Gtablet running an alpha version of Android Honeycomb.