A big pet peeve of mine is a bottom scrollbar in my browser when viewing a site. This happens when the person designing the page does so in a resolution greater that 1024x768 and assumes it will look right in 800x600.
soooo, here is a link to a neat little tool to make checking your work in different resolutions a breeze.
http://www.interactivetools.com/free...owresizer.html
p.s. also nifty for regaining your browser size after a site forces it to full screen.