I'm sure almost all (if not all) of you that have obtained root on your Incredible (which this app requires) know what this app is and possibly have even used it in the past. There doesn't appear to be any Incredible specific modifications made to the app yet, but I just wanted to throw this out there. As always, be VERY careful with overclocking, esp. with this CPU (I personally wouldn't try anything over 1.2ghz). If you feel your phone getting hot, don't keep running it! Also neither the author, XDA or I take any responsibility in the case that you toast your Incredible.
http://www.pokedev.com/setcpu/
http://www.pokedev.com/setcpu/