I'm new here, and I wasn't sure how to go about getting this included in the SVN repository. So, here it is.
Unlike most people, I run a dvorak layout as my keyboard. Much to my dismay, when I loaded Haiku the first time, I was forced to dig out a qwerty keyboard from my drawer of long-unused parts. I looked around, and couldn't find any way to switch to a dvorak layout. /etc/Keymaps/ had no such listing. So, I created one, and here it is.
It's effectively just the American 101 layout with the main keyboard section switched around.