I'm running an Asus A7V266-VM N-Force Motherboard in my office with Mandrake 9 on it and it works fine. The trick is to goto
www.nvidia.com and pull down the Linux N-Force drivers.
Nvidia provide docs with 'em so try it out and post back here if you get stuck.
All in all though I've found A-Bit mobo's are the biz with Linux and a KT-7 then KG-7 with 1/2 gig of RAM has done me fine at home for ages.
Good Luck