This might not be the answer you're looking for, but I've found that posture--particularly the angle of my elbows and wrists--makes a huge difference. I've bee

This might not be the answer you're looking for, but I've found that posture--particularly the angle of my elbows and wrists--makes a huge difference. I've been told that my elbows and wrists shouldn't be wresting on anything, my elbows should be at 90-degree angles, and my wrists should be flat. (This means the keyboard has to be at the correct height, just barely lower than your elbows.) Squishy rests and such feel nice at first, but the feeling doesn't last, especially if you're using a computer for more than an hour. You end up moving your wrists too much. I do like a good keyboard; my current favorite is a high-profile Topre Realforce keyboard. However, I'm under no illusion that the keyboard makes a difference in terms of RSI. It just like how it sounds and feels. The hardest adjustment for me was keeping my wrists up when I type. To encourage correct posture, I now keep my keyboard on the very edge of the desk so there's nothing for my wrists to rest on. It's also a bit difficult to find a desk that's the correct height--most are too high--but it's definitely possible. If you get one with a keyboard tray, make sure the tray is large enough to fit your mouse, too; personally, I need the same posture for my mouse as for my keyboard. It's often easier to get a shorter desk and raise your screen than it is to get a higher desk with a reasonably-sized keyboard tray.