Here are the stats of our last 6 million surfers and as you can see 800x600 makes no sense anymore coz if you also check the country stats you will find out that this is mostly traffic from Asia and Africa...

1024x768 2851160 45.43%
1280x1024 1865198 29.72%
800x600 550223 8.77%
1440x900 366689 5.84%
1680x1050 190175 3.03%
1152x864 189258 3.02%