I still find people advising to design for an 800 x 600 display but this really seems outdated to me. My stats show only 2.5% using such an old display. I think a content area of about 900 - 925 width makes better sense.
I should mention that my site site will be more like a landing page with a lot of graphics than a sales letter, most of which still go for skinny little column formats.
What width would you recommend?