currently: eggbeaters on one fg, campy pista with cinelli straps on the other. i started riding fixed on eggbeaters, so I'm way more used to them. So sweet. The pistas hurt after a while, but that's my fault, as I really should have better shoes.
Used to have Shimano 600, but they killed my feet. the back plate is like a guillotine.
On the road bikes, Campy Triomphe and Campy Chorus (early 90s, c-record era). Pay attention: Triomphes are the bestest pedal evar. They shine up like a dookie platinum rope, and are built for regular flat shoes, unlike most pedals. Best of all, they have steel cages (unlike c-record, CdA, and Chorus) so you won't break them after a month.
I'd like to get a pair of mks touring lites or GR9s. Lots of surface area. Not the sexiest, but real nice anyway. I'd like to try ATACs; Maybe when the beaters break.