[scottw]

I built one of these:

http://iamnotaprogrammer.com/Ikea-Standing-desk-for-22-dolla...

and I've been using it since early July and spend most of my day at it. It has significantly helped how my back feels by the end of the day. It's plenty sturdy (I actually bought two of the tables: one for my monitor and keyboard, the other I cut the legs down to the same height as the keyboard on the other table. I put my laptop on this one).

I also have a Steelcase Leap chair I bought in February which helped with the back too. I still use it for writing in my notebook every couple of hours.

I stand barefoot on a cheap backpacking foam pad which I cut in half. I keep a pair of flipflops at my desk if I need to run around the office. Every so often I'll do some leg stretches. I'm considering buying a quality antifatigue mat, but I'm making this work for now.