ThrottleStop 2.99.5
WARNING: ThrottleStop is an Intel Core 2 and Core i performance monitoring and modification tool. Some manufacturers throttle CPU performance to protect their motherboards or the power adapter from being damaged so keep that in mind before making any changes. Using ThrottleStop to overclock or over volt your CPU or to disable a laptop manufacturer's throttling scheme may damage your computer and is at your own risk.

What seems to be the main Throttlestop page right now:
The ThrottleStop Guide
related info from another post on notebookreview.com:
How to Supercharge the M11x with Core i5/i7 UM CPUs
some Core2 related info from other notebookreview.com posts:
How to Enable Intel Dynamic Acceleration (IDA) on Both Cores of a Core 2 Duo
How to Unlock the Core 2 Extreme Multiplier in Windows