I'm thinking about getting one of these for my Win '98 laptop:
Lucent WaveLAN Wireless Cards on Ebay
They're cheap as hell.
EDIT: Here's the computer, minus the DVD capability, Intel Centrino Mobile Technology (whatever that is), and no wireless LAN
Panasonic Toughbook-51
I believe this is the model, it's the one that looks the same.
EDIT #2: I take it back, I found the exact same Toughbook I have on eBay... for $65. Ha-fucking-ha. Nevertheless, I do wish to put one of those cards into my machine.
eBay Auction for the Panasonic CF-45 Toughbook Laptop