
This laptop processor benchmark comparison is similar to the laptop graphics card performance comparison: it gets data from the benchmark tables at Notebookcheck, reduces the amount of data involved (limiting the graph to the most usual processors) and plots them. The graph represents the scores in the 3DMark 06 CPU test, because this benchmark is available for most processors.
Complete processor listing: Intel Core 2 Extreme X9100 and X9000, Intel Core 2 Duo T9600, T9500, T9400, T9300, P9500, P8600, P7350, T8300, T8100, T7700, T7500, T7500, T7250, T5550, T5470 and U7700, Intel Pentium Dual Core T2390 and T2330, Intel Atom N270, AMD Turion X2 Ultra ZM-84, AMD Turion X2 RM-70, AMD Turion 64 X2 TL-64 and TL-56.

The case of processors is more difficult than that of graphics cards: the difference in real-life performance is small, even more if we take into account than in many tasks the bottleneck is the hard disk performance, and powerful processors are expensive. If you need the best possible performance for professional purposes, have a look to the original data, that covers more benchmarks (SuperPi, Cinebench R10…). In addition, you will find there some quad-core desktop processors, that are the processors of choice for processor-intensive tasks. Quad-core laptop processors have been announced, but there are not available benchmarks at the moment.
As usual, in case of doubt you can ask in the message boards.
Featured laptops
With Intel Core 2 Extreme X9100: Lenovo Thinkpad W700, HP Compaq 8530w, HP Compaq 8730w
Light laptops with Intel Core 2 Duo T9600: Lenovo Thinkpad T400