Optimal width for 1024px resolution?

I’ve been using 960 for some time now, as it’s slightly smaller than full width, and it’s divisible by 3, 4, 5, 6, 8, 10, 12, 15, and 16 (imagine the grid possibilities). I’d love to hear what all of you are wrestling with.

I was wondering why 960 was the magical number for a 1024 resolution screen when I found the above. Also see http://960.gs/ for more on grid systems!