Currently:
1998 Vord E350 Super Duty, V10, bought new, 455,000 miles on chassis, current powertrain from Downs Motorsports has about 13,000 miles on it and makes just over 500 horsies. She'll hit 60 in under 7 seconds and scares everyone but me.
1995/98 TZ250, currently on mothballs in case I ever get the urge to go motorcycle racing again
1977 TZ750, I'll restore it someday...
2006 Mazda6, actually the fiance's car. We skipped the "sport" body package but bought all the performance/chassis upgrades. Surprisingly quick yet totally subtle.
1992 SCCA A stock prepped Corvette, ex-Lingenfelter racer
I don't have the time to list everything else that I've owned through the years, but there will always be a special place in my heart for my 1984 CJ7 that I built from the ground up with a Chevy 350, Ford T18, and Dana 60s from a Dodge.
Totally appropriate for this thread, and my new signature, courtesy of Peter Egan:
"Rock & Roll and cars are just slightly different versions of the same mental disorder."