I agree with Jolt...
Unless you're trying to deliver a maximum amount of text-based inforation, it's generally better to maintain control of the site design.
Because a large percentage (near 30%) of users still use 800x600 dislay resolution (generally older machines or less frequent computer users) it's a good idea to code to a max width of 770 (actually i prefer 769px).
BioRUST was this way until just recently when M0g made the decision to exand to a 1024 screen width (In which case you would design to 993px wide).
In my opinion, static with, dynamic length websites work best from a design point-of-view... if design and presentation is less important the content delivery, a liquid design will give users with a larger screen res access to more information 'above the fold' so to speak.
Consider your market too... in BioRUST's case, a service intended for Design oriented individuals, the percentage of users at 800x600 is likely to be very very low, which was considered before moving to 1024x768.
I almost bought a monitor and video card yesterday that would allow a screen width of 3072px....
lol, imagine a 800px website on that
Mike.