I use Ntune everyday. More importantly. Nvidia monitor that comes with it. As I mentioned before Ntune software right now has the best monitoring software available for SLI/Nforce 4 systems. There are others out there I am sure. But few are as compact and carry the data for all components in the system.
Speedfan does that as well
it can o/c my old K7S5A from windows, giving access to every possible FSB/mem clock combination, even without the hacked BIOS I'm using (set at FSB 138).