I sometimes forget how many bicycles I have... five in the starting rotation...
I have my Xtracycle on the Giant Nutra that gets 5-6K a year that Does Most Stuff.
I have my Trek 7500FX for the light fast rides -- my "Sunday go to Century" bike.
I have the 1968 Schwinn Racer that I got from E-bay because my brother told me it's the best bike to have and we grew up on that year and model... it needs brakes, though, 'cause the rear wheel is pre-WWII.
I have a Dahon folder to ride to Enterprise when I rent a car, 'cause i don't own one. It is also excellent for Ambiguous Tours and Weird Weather, since it has 1.25" tires that handle sleet or stones or just about anything.
I have a Gazelle Impala because that grad student sold it for a sweet price when he went back to Holland and you cannot get a Dutch commuting bike in these parts. It's the one I put studded tyres on in the winter and it goesthrough almost anything.
I also have the 1960 ladies' Schwinn Racer that really isn't mine but I ride it sometimes and it's in my garage 'cause its owner bought it intending to try to ride and it didn't work out.
I also have a Schwinn Spitfire that I bought from the guy who had to sell some of the hundreds of bicycles in his basement. It's at my friend's house.
I think that is all. I also have a few otehr bikes in the garage (since there's no car to take up the room) from the bike coop whenthey run short on room.
With a fleet of bicycles, if one breaks I have spares (since I don't have a car, this can be important). It also means when somebody's got a friend from Europe in town for a few weeks, I can loan... even if it's a family ... most of my bikes cost less than $800 and I have purchased one every few years, costing considerably less than what I used to pay in a year for car insurance. (This year I sprang for GPS instead of a bike... it should arrive SOON...