What do you use for an ergonomic workstation?

First it was ergonomic keyboards and mice, then ergonomic keyboard trays and lumbar-support chairs. Standing desks came next, and as XKCD points out, we're not done yet. No surprise then, that the SXSW event led to display of some new ideas, such as Martin Keen's new Leaning chair, basically a repurposed tractor seat posted at an angle.

How do you stay comfortable for the 23.5 hours that you are parked in front of a computer? And with all this ergonomic stuff, when will the madness end?