This How-To is written just as a "Put together" from several Threads.
1) Download the 2.6.6 Kernel with 8k Stack
2) Install the NVIDIA-Driver from NVIDIA.com
3) Follow the Madwifi-Installation from CVS (by Picomp314, updated)
The new installation of MADWIFI is needed because you need to recompile the Module because of the 8k Stack. The RPM-Install won't work (if you try it you will get appropriate errors telling you that you're trying to use modules which are not compiled for 8k Stack).