Wow, I turn my back for a couple hours and a Linux fight started!
Hoxlund: yes, I've tried Knoppix, and I love it. Aviationwiz is right, Knoppix is Debian based. The problem (if you could call it that) is that it only resides in memory, which presents a few limitations. But, I do use it for testing laptops and how well their hardware is supported in Linux. (Side note: the vprMatrix laptops have got to be the most linux friendly laptops I've ever seen)
Dodeca's also right. I doubt I'll switch to anything thing else anytime soon. Debian's package management system is wonderful, though it would be nice if it had something similar to FreeBSD's port system (packages built from source). In defense of RedHat, I hear that RedHat Update is nice too, though I wouldn't want to have to subscribe for something like that...