Anything and everything to do with electronics of course, with a special interest in restoring and using older equipment.
I'm also something of a record-collecting fiend. My cupboards and shelves are full of old 45s, LPs, and 78s, mostly 1950s-1960s era pop and country.
Like smokem, I have an interest in older cars too, though time is a big problem. Had a '72 Pontiac LeMans a few years ago, and a '66 Barracuda more recently, as well as some older Brit models you would have never heard of. It was fun to drive one of the sportier models of the era, but not so practical as the old station wagons that I love (never been a TransAm/Corvette fan).