mickdarling, all my attempts too change CPU speed finished with hanging up. Now we have source code, so I'll try again.
Also on another hand, for EE it's far more important to underclock CPU, it'll allow to much longer battery life (p.s. power management in EE is completly failure).
As for overclocking, as far as I remember CPU spec said that maximum speed is about 1100mhz. Currently it work on 788mhz. Not a big deal (unless for gaming or HDvideo).