(I'd link directly to the Kensington site but their idiotic "click on your region of the world" feature makes that impossible)
I got to play with the Kensington today... it's actually surprisingly nice! Only downside is now your thin ipad2 is now as thick as a netbook... That's easily fixed: just slide the ipad out of the case when you don't need the keyboard. Also, it would be nice if they used some Velcro to make the stack more stable when the tablet is in vertical mode.
I'm looking forward to playing with the Asus Transformer too.