I voted 2, but I'm also about to "give birth" to my third. A build based on the Nashbar X frame...the rims, hubs, and spokes get here next week, and it will be on to my first wheel build.

I have my ATB for short "tennis shoe" rides, and my Fuji commuter rig for normal commuting. The Fuji goes "under the knife" once the new bike is built up. I have plans for that one...

Of course, I didn't count the wife's two bike in my answer either.