Here are my results:
Overclocked mid-2009 unibody (2.66 GHz, 9600M GT) mbp on Win7 64-bit:
GPU to 710/1150/1500 (core/mem/shader),
CPU to 3 GHz.
Checked stability with ATItool artifact scanner.
Reached:
3Dmark06: 7925 (up from 5063)
3Dmark Vantage P (GPU only): 2285 (up from 1192)
Geekbench 64-bit: 4550
Compared results with this list:
http://www.notebookcheck.net/Mobile-Graphics-Cards-Benchmark-List.844.0.html
I use Lubbos Fan Control, fans on maximum, then RightMark CPU to tweak CPU voltages to make sure it runs at 1.16V at 10x at 301 Mhz clock (3.0 GHz), using only the normal 10x step (particularly important to disable IDA 10x step which can up the voltage beyond 1.16V to 1.25V but then you can set its voltage lower too).
Temps while gaming (laptop lifted, moderate room temperature around 23C):
CPU max around 83C (usually around 80C)
GPU max around 80C (usually around 77C)
Gaming on October evening, open window, outside temp around 16C, helps keep temps even lower. It's worth mentioning that the rise in temperature of both CPU and GPU is gradual and in correlation to the temperature of the internals, so you will not see an immediate rise of components' temps up to around 80C, they will be around, say, 68C the first 5 minutes into a game and reach maximum only about 15-20 minutes later, so with good heat dissipation surface/cool room there is a lot of room for improvement, particularly at clocking CPU even higher.
Currently I'm using 285.38 beta driver, but got similar benchmarking and temps results also with 280.26 and 275.x.
I play BFBC2 all high, 16xAF, noAA, 1280x800 (plays fine also at 1440x900), nvidia control panel setting all high (no AF optimizations, no trilinar optimizations, high quality AF, no lod bias, clamp on), around 30 fps, didn't use fraps though. Of course if I lower effects, detail and shadows i get considerably smoother performance (say 60fps). Might check what fraps would reveal.
To conclude, these mid-09 unibodies are damn fine machines to tweak.