Now that the average Joe—you know who you are—can load XP on their Macs, let the benchmarking begin. Macologist ran about five million tests on similar and disparate machines and the MacBooks and iMacs consistently kept their heads above water. They didn't really run a summary paragraph, but all the numbers are there. While the methodology doesn't really compare Apples to, well, Apples, it's nice to see it in black and white.
Intel Mac Benchmark Smorgasbord [Macologist]