My users are cad/viz/photoshop/ graphic intense users. Do you really think they would be running 800x600, or even at there office? I cater to MY users not joe blow that knows nothing of graphics. You ever been to cgtalk.com? I guess you can tell them that there forums are too wide too....
No need to get into a pissing match on who thinks whos right and whos wrong, your entitled to your opinion
I run dual 19's, maybe you should upgrade so you can get the full advantage of your screen size.
Also here is some browser stats for ya.
http://www.w3schools.com/browsers/browsers_stats.asp
Guess 800x600 is getting phased out....