Palm Pilot Graffiti
observatory.designobserver.com
observatory.designobserver.com
I wouldn't like to return to it though; these days, I run Swype (http://www.swype.com/) on my Android phone, which I find to be incredibly quick and easy to enter text with.
I think another reason Graffiti worked so well is that it's just plain easier to train a human to use an alphabet that's similar to their native alphabet than it is to do full blown handwriting recognition. In other words, it wasn't just that the graffiti gesture set was easier to recognize by software, but also that people could learn a gesture set that could "help" the software along.
For all of the coolness of the iPhone, I don't enter notes into it often. The little type-writer kind of feels unwieldy. It is usable, and it may just be my perception (comparing typing on a full size keyboard to typing on the on-screen iPhone version). Makes my kind of miss Graffiti and using a stylus.
But alas, it cannot be done, because: patents and 'intellectual property'.
I actually loved Graffiti - much faster with it than Swype which is bundled with my Samsung Galaxy SII. Partly that's because I hate the predictive nature - being quite bilingual it's a pain to keep switching languages.
Taps are zero length swipes, swipes are fat fingered strokes... good lord, its a wonder we're allowed to touch the damn things at all.