The University of Washington (the school that may eventually give me a degree) has an ergonomics checklist online that covers chairs and chair positioning in relation to your desk/monitor, glare, keyboard/mouse positioning, lighting, and tips for preventing repetitive stress injuries. Fairly decent pictures make it easy to understand. The article finishes with a number of stretches you can do at your desk, also with pictures.
The Ergonomics Checklist is in PDF format (which Dragon NaturallySpeaking doesn’t seem to know how to navigate through — surprise, surprise).