Tracy & Craig,
If you have some say in the matter or are also spending some time at home glued to the keyboard,
try out a kneeling chair (link from your Tracy's link)
http://www.vitalityweb.com/backstore/Kneeling-chair.htmSmall enough to take to customers when I have a long running gig (giving me a chance to switch chairs there as well) and gets your body out of the "sleepy mode" reached after a few H.
Warning: NOT suited if you are working in expensive business attire (weak pun intended...)
regards
thomas
