Work surface height should be appropriate for the type of work being performed and the worker's dimensions. This is usually determined by individual standing or seated elbow heights.

Tilt of work surfaces. Most work surfaces are horizontal, which is preferred for writing and many other daily activities. However, where poor postures are noticed, such as leaning over a table to read documents, it may be advantageous to tilt the work surface towards the worker. This will reduce stressful, static postures of the torso and neck. An example would be a drafting table. However, smaller, tiltable stands are also available for desk-top work.

Chording keyboards are smaller and have fewer keys, typically one for each finger and possibly the thumbs. Instead of the usual sequential, one-at-a-time key presses, chording requires simultaneous key presses for each character typed, similar to playing a musical chord on a piano.

The primary advantage of the chording keyboard is that it requires far fewer keys than a conventional keyboard. For example, with five keys there are 31 chord combinations that may represent letters, numbers, words, commands, or other strings. With fewer keys, finger travel is minimized because the fingers always remain on the same keys. In addition, the user is free to place the keyboard wherever it is convenient and may avoid the unnatural keying posture associated with a conventional keyboard.

Commentaries and Information On Keyboard And Mouse Supports

Pros and Cons of Keyboard & Mouse Trays
http://www.office-ergo.com/pros&.htm#Keyboard Trays
http://www.office-ergo.com/pros&.htm#Mouse Support Trays

IBM Healthy Computing: Accessories - Keyboard Platforms
http://www.pc.ibm.com/us/healthycomputing/keyboardplatforms.html

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http://www.3m.com

Touchpads are relativley new out on the market as stand-alone devices (versus imbedded in laptops).  Most users either swear by them, or at them.

Touchpads seem to get better in their size and capabilities evertime I turn around.  As these devices do not require any force to operate, they have reduced the finger and hand stresses related to grasping and moving the mouse, and button clicking.  However, the knack of the finger tapping used on the touchpads seems to escape some people.  Early versions did not sense when your finger reached the edge of the finger pad (this was a problem when you were not yet where you wanted to go!).   Many improvments have increased touchpad usability and capabilities of late.