Just checked, and it in fact IS IN the fedora repos now
To install nvclock, su to root and type:
yum install nvclock nvclock-gtk
Its possible that you /may/ have to upgrade to the new nvidia 167.xx drivers to get GF8
OC working, but it might work as is as well.
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Notebook: Dell XPS M1330 Running Fedora 11 Linux (Leonidas)
Desktop: ASUS Rampage Formula X48
Intel Core 2 Quad Q9450 (Yorkfield) @ 3.51Ghz
4GB DDR2-800 PNY
Albatron 8800GT 512MB
Corsair HX-620 PSU
Running Fedora 11 Linux (Leonidas)
Dual Dell 2407WFP 
Drivers, Games, Demos, Mods and Overclocking Tools At AOAFiles