My first tablet was the Asus Transformer. As a product is sucked horribly, but the keyboard dock integration was done very well.
iPad has crappy clamshells and some other blah solutions, but from the looks of it, The Brydge seems to have nailed it.
Sorta pricey, but the hinge, locking system, and stereo audio are all winners. I was considering the Logitech Ultrathin, but this looks like it might be the better solution.