The problem with the dynamic table sizing is it won't work (well, it won't work well) if your graphics are customized to the display size.

We went back and forth about this a month or two ago when we wrote the specs for the (long awaited) redesign of our sites, and decided to do both 800x600 and 1024x768. I'm told we can use a PHP tool to determine the correct browser dimensions and then send the correct version of the site, so we'll be playing with that over the next month.