Depends on what I'm doing, really... Right now I'm carrying three - a CardSharp credit card knife (this one stays with me 24/7, unless I'm trying to get on a plane.) My main blade is a Pendleton Lite, just because it's functional for all my needs and is cheap enough that I don't have to worry about hurting it and costing myself an arm and a leg replacing it. I also like to carry something with a mean point on it, just as a self defense weapon. Today it's my Ti-Lite.
I also have a pair of boot/neck/keychain push daggers that I can easily carry around, as well as a 6 inch "miniature" bowie knife that I designed to fit on my ankle in a custom sheath. Occasionally I'll stick a small swiss army knife on my keychain, just for the scissors - but that has a knife too. I can get up to 7 pretty easily without looking ridiculous...
And if I'm hiking/camping, I'll toss on a machete too just for the heck of it.