I always thought that CTS was caused by the muscles in the wrists being over developed. But I just read the Wikipedia article[0], and it seems that there is no evidence that CTS is related to typing. I'm not sure if wrist health can be helped by braces or exercise, except that it can be caused by obesity.
This is a great piece of marketing though, whether it is intended to be one or not. I wonder how many wrist braces were sold.
When typing, the muscles on the outside of the forearm (anterior group) get a lot more use than the ones on the inside (posterior group), so they get a lot stronger. This lack of balance is (likely) a contributing factor to CTS, in the same way that a weak neck and thoracic stabilizers cause UCS (upper-cross syndrome)
Climbing is ideal here, because you spend a lot of time grabbing and holding on from odd angles, giving your entire forearm a solid workout.
This is a great piece of marketing though, whether it is intended to be one or not. I wonder how many wrist braces were sold.
[0] http://en.wikipedia.org/wiki/Carpal_tunnel_syndrome