This is a page with all sorts of alternative keyboards on it. The further down the page you go, the wackier they get. Too funny. I can't imagine ever typing on some of them. http://tim.griffins.ca/gallery/keyboard/all.html
I was actually considering buying one of those Maltron keyboards...until I saw the $400 price tag! I thought this one's kind of interesting: http://www.thinkgeek.com/computing/input/77ba/
I see your Das Keyboard and raise you: Optimus According to the release date there, it's a little behind schedule. But honestly, I think I'm going to end up buying a desktop PC just to use one of these