Knoppix is a complete linux kernel distribution that is designed to run entirely from the CD. They took the phalck idea a step further and put a fully functional linux on CD that would auto-detect the hardware on any PC and run, complete with the KDE gui.
If you really want to get to know Linux, the best way is to take your SuSE, install it and use it. You'll have to make decisions on what services to install, device drivers, X or no X, what shell to use for the command line, etc. You can really personalize it to your tastes. That's the beautiful part about Linux. I say SuSE because you already have it. You may want to look into the ever popular RedHat, or FreeBSD.
If, on the other hand, you just want to "get to know" Linux, use knoppix or install Cygwin. Whereas Knoppix is a complete Linux distro on a single bootable CD, Cygwin is a linux-like command interpreter. It's great for learning how to run a basic linux command line, and alot of command-line based programs (like nmap and S.A.T.A.N.) will run under Cygwin. (I don't know if you've seen cygwin or not, just threw that in as an opt.)
I personally prefer knoppix to cygwin, as knoppix is a true linux kernel. The best part about knoppix is that it can be run entirely from the CD without even touching your hard drive (it won't even make a swap file!).
btw: I love your avatar, scriptkiddie18....that's truely unique FreeBSD installation :p
