Having recently noticed a little carpal tunnel (though in truth I don't know how to distinguish the two) and got rather sensitive to where my wrists rest on a laptop I can sympathise! I switched to a vertical mouse earlier in the year which has helped massively. My right wrist was always the most affected, and it turns out it was mostly down to mousing.

Very true on games. I'd use for this too, and learning. Like someone else mentions a reactive keyboard would have been great when I was learning vi!