Might be one of those old school ergonomic Microsoft keyboards. It had a split in the middle, just like this one, with a little dial to adjust. You could fold the entire thing in half, or split it in half, if you wanted. A friend of mine has one that he swears by. It's perfect for putting a CD player under.

Loren -- if that *is* one of those MS keyboards, do you have any leads on where I can get one, now that they're no longer in production?