I might be off-topic with the recent replies, but just in case somebody can't get the Centrino Pro2100 wireless network card to work under Knoppix / Linux with Intel's official Linux driver, you might wanna try the Ndiswrapper.

It's been working out quite well for me so far and this way it's even supporting the Ad-hoc network feature yet. Don't know what the side effects are though for using a windows DLL on a Linux system...