Thoughts on touchscreen input

Am always looking for the optimum mobile device input mechanism- and the ipod in landscape mode is the best i have at the moment. However, still can be frustratingly slow comparisoned to a proper keyboard; but then i realised that the input rate is probably comparable to my speed when actually writing with a pen, and when thought of that way, then maybe its restrictivness is not such a bad thing. After all, i often lament how typing a piece results in an impatient and often insuficiently considered torrent of words. This i felt was in contrast to the deliberation forced on one by manual writing with a pen. Well is not laborious touchscreen writing similar?