ShyTorque,
I know exactlywhat you mean - I have to carry 2 wifi cards with me, because card 1 (Netgear) doesn't work on some wifi LANs and the D-Link card doesn't work on some others.
Fortunately I have not yet found a network that neither works on!
It is cold comfort, but I have definitely found that some cards just DO NOT work with some WAPs. And Lord knows I have tried!
If your wifi adapter is built-in, you can still try another in the cardbus slot.
SD