Heh, you are both correct. It;s true, I do all my work standing up. That setup was supposed to be temporary (found an old table and cut the legs a bit shorter) but I'm still using it 8 months later. I do roughly 6 hours a day, sometimes less. Now I split my work into serious (design/photoshop etc, standing up with the Mac Pro) and less serious (emails, web research etc, sitting at the dining table with my laptop).

I like the standing desk, I feel more focused when working and it's much easier to walk away to take a break. I wrote more information about it on my website.

Thanks!
It's good. It takes a while to get used to, but I can stand for hours at a time now, without discomfort.