Did anyone ever notice that the geekbench scores comparing these two processors in the 2010 iMacs are VERY close? I am still a huge fan of a high clock speed because alot of programs and applications don't take full advantage of all the cores in a quad core with a slower clock speed. Clock speed is still a good thing. The 3.6ghz is a dual core with hyperthreading so it has 2 virtual cores and 2 actual cores with 4 mb of cache, while the 2.8ghz is a true quad core with hyperthreading so it has 4 virtual cores and 4 actual cores with 8 mb of cache. The geekbench results score them very close. If I had to choose....it would be the 3.6ghz because I think the higher clock speed will give you more of an advantage on a daily basis. It seems that most of the new Sandy Bridge processors that will be in the new iMacs won't have very high clock speeds, except for the very high end upgrade.