A lot of ergonomics how-to sites recommend keyboard trays, usually attached to the bottom of the desk, to ensure your keyboard is at the right height, meaning you can type with your wrists in a neutral position without having to stretch your arms away from your body. (Hm, was that a run-on sentence?) I actually put my Touchstream keyboard in my lap when I type, so when I stumbled across a site that sells keyboard platforms that are designed to rest in your lap, I thought it was an interesting idea. The platform is called the PowerBoard Lap-Held Keyboard Platform and it's designed particularly for "tele-commuters and contract workers who have multiple or make-shift workstations." So, if that's you, check 'em out.