I've been standing while using my laptop for the past year due to having a suitably-heighted chest of drawers in my room. I have to say that I've experienced a few of the advantages mentioned - specifically the increased musculature and lower fatigue. That laptop stand looks nice, but I always use a mouse...
I'm doing the same, just had to stack furniture a little. It's been about a year for me, too. I started doing that after I read a blog post about sleeping on a hard surface (something I started doing years ago). The guy (who was a waiter, worked on his feet all the time) talked about how never sitting, in addition to sleeping on the floor, is a relatively easy path to good posture and less back pain. I'm inclined to agree with him: the little back pain I did have hasn't bothered me for a year.
Sleeping on a hard surface, eh? Any interesting links or comments on that? I've been wondering lately about how habitual shoelessness might ease back pain, but I don't know how much of an effect shoes have on the back.
I vaguely remember a study about an Asian country where they mainly sleep on floor mats, and they have less back problems there. Can't seem to find it now though. I'm mostly just seeing a lot of anecdotes. Maybe it's one of those things where that varies between people. Can't find any real studies on it though. For me, though, it definitely helped my posture and back problems. I don't know much about barefootedness, aside from that you shouldn't run barefoot. I'm sure the story's different if you're in some remote village in Kenya though. Or in that one African country, where they'd just keep pace with gazelles until the gazelles collapsed of exhaustion. Persistence hunting is extreme.