As a Google engineer, I get a 24-inch widescreen monitor and a huge amount of email. I built a Labs feature to use the former to mitigate the latter.
In my work email, I have painfully long lists in both Labels and Chat, so I used to scroll constantly in order to see my Labels. Now, with Right-side Labels enabled, I can see both my Labels and my Chat buddies at the same time, with one on the left and one on the right. (This is where that widescreen comes in handy.) Some of my coworkers preferred to move Chat instead of Labels, so I made that an option as well.
FYI: these Labs aren't currently compatible with the "Navbar drag and drop" Lab that allows you to drag and rearrange Chat and Labels on the left side.