Update: There's video after the break! Here are some thoughts:
We're very torn on the LG Quantum. From the outside you've got a design that can only be named as "frumpy," with wasteful curves and rubberized edges, along with the smallest screen of the AT&T bunch. Still, slide this puppy open (if you can manage, it has a really stiff mechanism), and you're treated with one of the best QWERTY keyboards in the business. Not only is each key nicely articulated and easily but responsively clicked, but you can really feel each key with your thumbs. It's the touch typist's dream, at least for the landscape orientation.
LG Quantum first hands-on!