You know, I had it running just fine under Mandrake 9.2 by following a good guide on the gentoo forums, the same still works for the 2.6 kernel for Mandrake Community 10. Only problem I've found is that NVidia has yet to put drivers out for the kernel that comes with mdk10, so you have to go without these drivers (still works fine), or modify your kernel to cheat the script from nvidia into working.
The readme that can get you quite alot of good info to point you to the general aesthetics of xfree can be found
here. Actually, for the 2.4 kernel, this is just about all you need to get everything except a couple of specific things working. He did his homework here, so I don't have to.
The one section that will matter the most to you will be:
Section "Monitor"
Identifier "wide-screen-lcd"
HorizSync 30-64
VertRefresh 50-100
Modeline "1440x900" 106.47 1440 1520 1672 1904 900 901 904 932 -HSync +Vsync
EndSection
After that, just try to emulate his XF86Config-4 file as best as possible to get it all nice and pretty in the GUI app of your choice.