Of course, Check 21 makes the digital image of a check the same as the paper version. The digital imaging of checks by consumers will not prevent the banks from processing the check just like any other as the paper check is not needed in any event already. While the process cuts down the float time for the person writing the check, the advantage of saving time at the bank is a draw. I couldn't find the app on the Blackberry, but would bet that it will come along as well in time.
So, how do you do it? See this video on how to deposit on an IPhone.