[buckler]

There was a pertinent discussion about height adjustable desks few days ago, see here:

http://news.ycombinator.com/item?id=1285775

I highly recommend them, if you can get one for your home office (or if you work in a office that allows desk of your preference). Some people go even further and get a treadmill underneath the desk, but I like to switch between sitting & standing personally. Standing up while working gives me an active feel to it, and I find myself avoiding procrastination since my legs would get tired if I were to spend hours surfing the Web (sure, I could adjust the height so that I can comfortably sit again, but the decision becomes more 'conscious' in a sense).