Back problems
sachmanb: i used to get back pain from working too much as well, but a chair solved that.  i think i take more breaks now too, which was a factor as well, but the chair upgrades made the biggest difference.  i love my freedom chair: http://www.humanscale.com/products/freedom_index.cfmif an expensive chair isnt an option, figure out how to get good lumbar support in some other way, and make it easy for you to slouch, distribute pressure, etc....prob is , slouching in most chairs will result in pain, but when you work this much, sitting upright can only be sometimes -- thus the freedom chair.  ted talk on the chair: http://www.ted.com/index.php/talks/niels_diffrient_rethinks_...