1) fixed gear conversion, bullhorns... older raleigh capri frame. This was my commuter, now for fun rides.
2) fixed gear conversion, ergo drops, lights, racks, panniers, flip-flop rear wheel, '98 bianchi volpe frame. This one gets ridden every day.
3) my dad's old mtb (not actually mine, but it's at my house and I use it more, so I'm counting) for the very nice mtb trail near my house. I've ridden this once in the last few months, but hopefully will be getting out more often!

also in my house right now:
fiancee's hybrid
borrowed mtb for fiancee
borrowed mtb for friend
2 gaspipe frames for freakbike tandem
1 tandem frame