3 for me.

1) Jamis Xenith Pro carbon roadie (glad I got her last summer, now that DH is out of work)
2) Trek Fuel EX 9 mtb
3) Trek 520 tourer. Has yet to see much touring, I'm afraid, especially since DH doesn't have one, and we can't be buying any toys just now.

I always try to sell whichever one is being replaced as soon as I can, to help finance the new one. Sold the Trek 5200 over the winter, to make up for the Jamis.

I have a question for Shefly and anyone else in the 10-bike range (or even the 5-bike range, for that matter). When do you ride them all? I can't find enough time to ride the 3 I have. Last summer was my highest cycling year ever, and I still only got on the mtb 1-2 times per week, commuted 1-2 days a week on one of the other 2, and rode-rode-rode the new road bike. This year I'm back to running and (theoretically) swimming again, so 3-4 biking days per week is all I'll be able to squeeze in. With 10 bikes, a person would have to do double bike workouts 3 days a week, just to use them all!