My company (in the US) has just started upgrading to adjustable height desks in the past year or two; they're not motorized, but have a mechanical system that allows you to adjust it easily despite the weight of the desk and monitors. I tried alternating between sitting and standing, but I've fallen back into the habit of sitting again. Perhaps I should give standing another try.
I am very interested in this info as well. Between work, contract gigs, and my own projects I spend too much time sitting.
I had a habit of going for a mid-day mile or two walk to help balance things out, but the weather has been so toasty lately that I just can not bring myself to do that anymore.
I am definitely feeling the effects of the sedentary lifestyle.