Kinesis (from the Greek kinetikos, or "damn you, carpal tunnel syndrome!") have released a Mac addition to their Freestyle line of ergonomic keyboards, which allow users to split the keyboard in half for optimal positioning. This is accomplished via Kinesis' Pivot Tether™ technology, which appears to be, uh, a cable that connects the two halves of the Freestyle.
Kidding aside, this actually looks like a nice solution for those of us whose wrists are ravaged by unfriendly keyboards. I particularly love the big Esc/Force Quit button up on the top left -- clearly the design team at Kinesis has the same build of Firefox I do.
$99 for the Freestyle and $40 each for the Incline and VIP snap-on accessories, which provide a 10 degree slope and wrist supports, respectively.