The RIM Blackberry playbook is on sale now in the US.
BlackBerry PlayBook now on sale in the US and Canada, starting at $500 with 16GB of storage -- Engadget
The PlayBook uses the QNX operating system and a Webkit browser. It is supposed to be able to run Android apps at some point, but that sounds like a bit of a kluge. This will probably do well in the corporate world, but I can't see it having much impact outside it.