-One is my main password I've been using since I was 12. I still use this for most website registrations, and I use a variation of it for my email, so that's 2.
-One for my wow account that changes every month or two.
-On a select few sites I use one other password.
So I guess 3. Oh, and 4 if you count my router.
I never understood the mentality behind having multiple passwords anyway. I keep my WoW pw separate because a lot of people have it, and my email one is different because one friend knows my forum pws and stuff. But I'm not very paranoid.