ndiswrapper is supposed to be an easy solution, but as this thread shows, it's far from.
Since you guys seem to be comfortable with basic command line usage, why not try my Marvell wifi driver dotpup from http://www.dotpups.de/dotpups/Wifi/wireless-drivers/
TRENDware 802.11g 54MBPS PCI card driver?
I got it working! I found a site that said they used ndiswrapper version 1.20rc1 with the mrv8000c drivers and it worked for them. I downloaded the 1.20rc1 source, compiled it and now my card is working perfectly! It's connected without encryption. I haven't tried connecting with encryption, but it doesn't really matter because the system is going to my girlfriend and her wifi is unencrypted.