Quick hat tip to Andy Edmonds, for his "big screen" extension, which helps those of us with giant monitors view pages that don’t render so well at large sizes. Allows you to split your screen up into multiple panes, plus a couple other cool features like draging-n-droping links between windows. Andy has been working on issues like this for a while, his earlier linked views FF hack allowed you to scroll two side by side windows at the same time.
Andy Edmonds is one smart guy, BTW. If you care about testing, you want to grab the "Always Be Testing" feed in your newsreader. Here’s a recent example, where he shows how test results may vary between new & returning visitors… and how to get at the truth with Google Analytics.