I've been dealing with tendonitis in my right arm on and off for 10+ years now, since I started programming full time and left my cushy grad school gig. ;-) I have tried to maintain some some of ergonomic office for the past 10+ years in order to prevent further aggravation of my right arm. And I happen to be working through a particularly bad bout right now with lots of visits to the chiropractor and ice. Lots of ice.
Long story short, I now have a pretty damn cool set up at home thanks to an acquaintance. I'm now sporting a whole lot of cool gear, including a chair, monitor arm and keyboard and mouse tray, from Humanscale. I'm looking forward to spending a lot of time in the updated home office!