Over the last couple of years I've been having a couple of problems at work: increasing lower back pain and decreasing attention span. I had no reason to assume either had anything to do with my desk: I, too, rock the Aeron and think it's comfy as heck. I've got my keyboard and monitor at the right height. I take breaks every 30-60 minutes and go walk around. Etc.

But as the back pain kept getting worse, I finally decided to give the standing desk thing a try about 3 weeks ago. I expected my back to start feeling better, and it did -- great! But the unexpected benefit has been vastly increased focus: I somehow feel much more motivated standing than sitting. There's something that feels incredibly silly about watching YouTube or reading Hacker News while standing, and so I just don't do it. I've been more productive these last 3 weeks than I've been in a long, long time.

Perhaps it's just the novelty of a new situation; who knows. But I'm going to stick with it, for now.