Re: Have we forgotten the Asus Transformer?
Actually there were several iterations of the Transformer after that that also had a battery in the keyboard. Unfortunately Asus changed the connector design and apparently stuffed it up, My Transformer finally died a little while ago and the likely replacements all had pretty bad reps for reliability. Asus now seem to have abandoned the format for Android devices. Pity really, I certainly think it's the best option if done properly.