Sean Buckley is apparently more obsessed by keyboards than I am. From his roundup of weird typing devices, where I happen to own the Alphasmart Neo (and its successor):

I learned about boring keyboards in college, when a nasty case of carpel tunnel syndrome threatened to silence my fingers forever. Then, one day, my father lent me a ridiculous vertical keyboard that changed how I think about typing. Now I can’t stop collecting oddball keyboards.