Loren Feldman, from 1938 media, just posted a hands on video of the T-Mobile G1 and overall, it looks as expected. The overall build quality is tight and solid and that screen slide to keyboard will simply never get old. I love the little arc it opens at.
Loren believes that it's all about the keyboard and that having the physical keyboard is a ton better than the iPhone's touch input. He drives home his point that Apple should seriously be worried about the T-Mobile G1 because it is a really great device. Click the link for the whole video!