If you are trying to decide between the 2.53GHz MBP and the 2.8GHz MBP, consider this factoid: When running 3D accelerated games, the 2.8 is 32% faster on average even though the CPU cores are only running 11% faster. That's an average of multiple games at high settings at both 1280x800 and 1440x900. So if you are a hard core laptop gamer, the 11% price premium on the 2.8GHz is worth it. On the other hand, if you only run CPU intensive apps, you'll see a 11% gain that matches the 11% price differential. I haven't tested Core Image intensive apps yet but will report back in a few days.