I've searched high and low and found alot of values, just not in one place, I think we should all compare in one place to see which setup would be best for our droid2's and x's. I just got jrummys overclock app from the market and he says to start low and run it for a couple of days then increase a little (after performing a nandroid backup of course) which is why I havent jumped into 1.45ghz. So anyways heres mine.
Overclocked- 1.2ghz - Low voltage setting
Fission Rom v1.2
Battery after overclocking seems exactly the same.
Noticeable speed increase in all areas.