Amusingly enough, I'm pretty sure someone over at Seesmic has been using my Twitter tools excessively to see who or what is being asked/answered by the @askseesmic account. Someone is doing some serious Twitter research.
frankly, at this point, the lions might best use social media to make organizational decisions. their current management is clearly not up to the task.
I'm late to the conversation, but I believe your hand-position analysis of the iPhone to be flawed. The iPhone keypad actually functions better (and the suggestions are easier to work with) if you use the two-handed approach. Also, the one-handed approach means that correcting a mistake takes the user completely out of their typing flow. The two-handed approach, on the other hand, allows the user to simply (and naturally) tap the backspace key to make a correction.
This being said, I agree completely that the BlackBerry keypad is far better, and if typing a lot if important, the BlackBerry is still the way to go (and the way I go).