I've got a Netgear MA521 which uses the realtek 8180 card. The drivers from Realtek are compiled for certain kernels, nothing newer than 2.4.20.
I've been using Linuxant's DriverLoader, which is an NDIS wrapper. Install it, point it to the newest windows driver for that chipset, and it works. Granted, after a 30 day trial, it's $20. And I couldn't get it to work successfully with 2.6.2-1.