I've got it on my Dell Latitude XT. It's pretty awesome, but having to live without the N-Trig multitouch stuff at the moment as the beta versions were a bit buggy. That, in itself, makes using it a little awkward as touch doesn't seem to get disabled on the login screen and the default touch behaviour is a little over-sensitive. I'm assuming it'll go away once finalised drivers are available.
*And yes, I know the XT isn't technically a slate, but my machine spends 98% of it's life in slate mode.