Updated 12/19
bzo has created a new kernel here that needs testing:
http://forum.ppcgeeks.com/showthread...39#post2016367
Prior to this kernel, if startup.txt was overclocked, pm.sleep_mode had to be set to 2, disabling power saving features and halving battery life, or else sleep of death would occur. This new kernel allows overclocked phones to set power saving pm.sleep_modes and should improve battery life for overclocked phones significantly.
If you can help test, and provide feedback if it worked for you, it would be very helpful so that the update can be submitted to the kernel team.