If you are making any wireless choices based on Knoppix, you are likely in for trouble. I have a wireless card that worked under 4.02 but stopped working under all versions of 5.x. I also find that several other wireless cards that I have that Knoppix never worked with work find under other hard disk installed versions of Linux and even other Live CD versions. I suggest trying a few alternate Live CD versions to see if you current card isn't now well supported after all (I would start with BackTrack 2, Mandriva and Puppy Linux, in that order). If you do come to the conclusion that your old card just isn't going to be supported, I would suggest either finding something that will work with a more wifi-friendly version of Linux or at the very least waiting until the next release of Knoppix (expected "real soon now"(tm)), otherwise you might get something that somehow does work with the current version but stops working when things change again.