Hi,
I'm having trouble too making my DWL-510 work under any Linux 2.6.x... it did work under 2.4.x
Anyway, you should download ndiswrapper (
http://ndiswrapper.sourceforge.net) and give it a try. As for the drivers, download the realtek RTL8180L drivers (the ones for windows, as ndiswrapper uses windows drivers) from the the realtek site.
As for the rest, I'm still trying to make it work, so good luck...