I bought the ASUS WL-107g.
It is Ok.
Be careful about your router.
Is it the Deluxe model or not?
If Deluxe it could be boosted higher then 54MB so you need a card that can deal with that.
I think that any PCMIA card that is wifi certified is OK (but it must be at least in 802.11g).
Apparently they could have some compatibility problems between card and laptop due to cardbus. But I am not competent enough to explain.