Me?
Endura in VG-10
Griptilian in 154CM or whatever it is that it's called
Both of my Case mini-trappers
And, oddly enough, my brand new Buck Vantage. We will see if it stands the test of time, but my initial day of carrying it has been extraordinarily impressive. I bought the cheaper model just to see if I liked it, and I will be ordering the S30V model forthwith. I really, really like that knife a lot though I have to temper my opinion since it has only been a day. Plus, I don't think anything will ever take down the Endura as my all time favorite knife unless it happens to be another Spyderco.
Anyway, I have about 15 or so other knives, of which I occasionally carry one or two, but those first three knives I listed are basically always in the rotation simply because I like them so much. I have actually just stashed one of my case knives at work (the regular trapper) so I never have to worry about it, and the other (2007 Wharncliffe Trapper) I have started treating as something of a "BBQ Knife". It will be getting shipped off to this guy on Bladeforums that is a sharpening deity. This guy can slice standing toilet paper cleanly, and by Odin, I want to own a knife that sharp.