What about using OmapClock 0.2? I've been using this software quite a long time.. It did not giving me any problem. Normally,i'll clocked it to 260mhz. Stable and fast.. But this software has a bug is that the clock will gone once you switch your phone to sleep mode. When you turn it back on, it will go back to 201mhz. I've settle the problem by bundle with Memmaid software. Puting a shortcut in to memmaid's notification queue and it will continue to clock at 260mhz when the phone wake up. First, you have to create a shortcut by using notepad and wrote :
40#"\Program Files\OmapClock\OmapClock.exe" -clock 260
Save it to exactly "OmapClock.lnk" then put it into My Device/Windows/start menu, next using memmaid add a new entry to the notification queue pointing to the above shortcut and with the argument "AppRunAfterWakeUp". This makes the app run and set the higher freq everytime you switch back on your phone.
Will the phone still running at 260mhz when it sleeping? NO, don't ask this question again.