Ask HN: Best Ways / Products to Reduce Wrist Pain

Basically, at the crazy time of being an undergrad in college, my wrists are already starting to hurt occasionally. Nothing tremendously painful, but still an annoying twinge some days.

So I'm asking a couple of things: what kind of setup do you use to keep yourself healthy? Especially, what kind of pointing device and what kind of keyboard (specific products or general types of products are fine) do you use? Are there any specific exercises you do that seem to help?

Anything else related to this topic is fine too - Amazon links, helpful blog posts, and general advice are are welcome. I use Windows most of the time, but I would think that most hardware should be cross-OS anyway.