kernel-module-nvidia-driver for kernel-2.2.22-1.2149.nptl?

[HD]

I keep checking http://www2.educ.umu.se/~peter/nvidia/ for the new 
kernel-module-nvidia-drivers but there has been not change there since 
kernel-module-nvidia-driver-2.4.22-1.2129.nptl so as a result I am still 
using the 2129 kernel. I did try installing kernel-2.2.22-1.2140.nptl 
but could not start X with that kernel, I am assuming because I have the 
wrong kernel-module-nvidia-drivers installed. Does anyone know anything 
about present and future updates from 
http://www2.educ.umu.se/~peter/nvidia/ ?

I have another (linux newbie) question that is closely related to this. 
When someone installs a new kernel it is assumed that they would want to 
give a test run to see if it is going to work well for them. But it 
appears that testing in X is not possible without updating the 
kernel-module-nvidia-driver. IF the new kernel is installed and the 
corresponding kernel-module-nvidia-driver is installed then X will no 
longer work for the previous kernel. So, if the new kernel does not work 
well, is it possible to revert back to the old 
kernel-module-nvidia-driver? How could this be done? Are there other 
alternatives?

Thanks!
-- 
HD

Tipping my hat to Fedora.