I have been wanting to do this. This thread was an excellent reminder, so thanks for posting. We have standing desks at the office, but I have been reluctant because I'm addicted to having a second monitor! But, I finally got my portable monitor from work, so I should be able to use the standing desks in the office now. I will try it the remainder of the week and see how it goes.
On another vein, what kind of shoes do you all wear? I'm thinking sneakers would be best, but definitely a no-can-do in my office. Do any of you do this in daily in heels?