I've just read on Xbit-Labs that Intel is planning to use "Performance Ratings" for their processors :
Paul Otellini, the president of Intel Corporation, confirmed at IDF that the company will start using a kind of rating for their future processors. It is now officially stated that the biggest CPU-manufacturer in the world will introduce another metrics apart from the core-clock speed.
In early 2003 Intel unveils their brand-new Banias processors designed specially for notebooks. As we have reported numerous times, Banias chips will be clocked lower than the Pentium 4-M CPUs, nevertheless, thanks to some architecture advantages and 1MB of L2 cache, the newcomers will be able to offer almost the same level of performance. Since Banias based platforms are aimed on a bit different market segment than the Pentium 4-M powered ones, Intel will have to explain the customers why Banias work at lower frequencies and the difference between “Mobile Internet PC” and “Transportable Notebook” concepts. In this case, Intel will have to introduce a new way of measuring processor’s performance and also the correlation between the clock-speed and working time.
According to Paul Otellini the rating will not be based on the performance only , but also the time the CPU can work with the same battery.