How to train your iPhone to spell the words you use

Having had an iPhone 3G for a few months now, I had noticed that it seemed to learn words after you had typed them out a few times, adding them to the dictionary for that phone. I had even wondered if there was a way to get those words directly into the dictionary, but presumed it would probably be protected and tricky to do. Hackszine points out that there is a nice simple way to do it, simply type the words you want into notes a few times, until the word is learnt:

Hackszine.com: Train your iPhone’s dictionary