I try to make my sites fluid so they will automatically expand or contract based on whatever size the window is. You can check out my link below for an example. Open my page, then change the size of your window from larger to smaller etc, and the text all autoformats to accomodate your window resolution and always fills the page. As someone who runs 1600×1200 all the time, I cringe every time I hit a page hard coded to 800×600 and have 1/2 of my screen blank on either side. I am not a super web techie, but from my experience it is just a matter of making certain columns based on percentages rather than fixed pixel amounts.
CBW