My workplace's ergonomist introduced me to WorkRave, which basically reminds me to move if I've been working uninterrupted for too long. I have it on a fairly intrusive setting that prevents me from typing on the breaks, but I can override it if I choose to.

I have an actually split keyboard at work, which is kind of amazing. I want the cord to be longer, or it to be wireless, and two little pads that sort of float and I can place anywhere my fingers want to be...

I think my actual ideal work position would be a face-down "swimming" sort of position, sort of like you get on a massage chair.