[tptacek]

There is evidence in the opposite direction:

http://ergo.human.cornell.edu/CUESitStand.html

Being stationary in either a sitting or standing position is bad. There are ways in which sitting is uniquely bad, but there are also ways in which standing is uniquely bad. Both are bad. The answer is: you need to walk around or in some other way incur gross motor exercise regularly, on the order of twice an hour or so.

This has been one of 'tzs beats on HN for the past year; he's written some pretty detailed comments, try searching at the bottom of this page for [standing by:tzs].

[jquery]

That's... pretty alarming. I wish it had citations so we could evaluate how compelling the evidence is.

[tptacek]

Just Google for [atherosclerosis standing]. This is well-studied, not because of ergonomics but because of correlations between heart disease and the occupations of people likely to develop heart disease.