Although it is 2001 it still gives you the relative safe areas to work within, that was more the object of the link, I should have explained that. Apologies
I agree that the stats show a lot more people use 1024 now, and it would make it easier if it were just 1024, and to discount the 800x600 completely. You could be losing a lot of potential sales; I personally use 1280 resolution for surfing, but for those with 800x600, they have to scroll sideways if you design solely for 1024.
There are the odd corporate clients I have that still insist on 640x480, even after being informed of resolutions, as they have legacy clients who complain at 800x600.