Forum Moderators: open
Yeah, the most common resolutions are 1024x768 and 800x600 but there are loads of other sizes out there to consider including 640x480, portrait displays, PDA screens, hi-resolution monitors, TVs etc
And even if you decide to ignore all them and stick to a static site that fits the big two then you're still ignoring the fact that the user may not have the window maximised or may have an Explorer Panel or sidebar open.