I use one of "these":http://www.microsoft.com/hardware/en-us/p/natural-ergonomic-keyboard-4000/B2M-00012 at work. It's a split keyboard and it took a little getting used to, but I find that for extended periods of typing, it really does make things more comfortable. I typically ignore all the extra keys and buttons and gadgets on it, though I have mapped a few of the extra keys to some of my favorite commonly used Qt Creator features.
At home, I'm a traditionalist, and still enjoy my "Model M,":http://en.wikipedia.org/wiki/Model_M_keyboard which I've been using for years now. I love the clicky feel from the buckle springs and the sheer weight of the thing. It's truly an old friend.
Edit: @bobby - You might be using a Das Keyboard, but the Model M was the original DOS Keyboard. :-)