A nice comparison of data entry performance. Typing on the iPhone is okay, but I much prefer a normal USB keyboard. I never did much entry using Rosetta or Grafitti. The Treo keyboard was decent, but not great. The BlackBerry disadvantage: noisy during meetings!

That said, my worst data entry method is definitely paper -- serious readability concerns! ;)

http://hardware.slashdot.org/story/10/01/22/0812222/Pen-vs-Keyboard-vs-Touch-vs-Everything-Else