In my own case I'm running with the first available IBM wifi card with provided drivers as well from IBM, but need I say that this card only supports WEP64/128. The Generic MAC Wrapper driver (GenMac) of Willibald Meyer doesn't do it for this IBM card either so new hardware needed and minimum recomendation when talking about wifi encryption should be WPA/WPA2.
But for the full article about wifi speed cracking, check out The Register.