I can recommend the typewise keyboard. The keys are hexagonal and you use gestures to delete, restore and uppercase letters. Therefore you have bigger keys for the same amount of screen space. It's not QWERTY, but the keys are in the region of their QWERTY location (i.e. not something totally different like dvorak). I needed some time to get used to it, but I really like it and don't want to go back.

Edit: rephrasing for clairity