Typists generally fall into two camps - those who are trained and those who type with two fingers. And as Edward has pointed out elsewhere if you are a two finger typist practise will only make you a better two finger typist. But I was watching my son the other day on the internet and he gave every appearance of being a fully trained typist. So I asked him where he had learnt. His reply was that he had taught himself - not from a book or tape or computer based program by rote. He had simply taken the two finger idea and extended it to all of his fingers! So here we have a new category somewhere in the middle between the fully trained typist and the two finger one. For me what is interesting about this is that every person on this site has had to type in order to use it. How many have thought about this as a possibility - even as we discuss thinking and creativity. In my case I certainly had'nt.
One of my approaches to learning to type, while typing, was to print out a smaller version of the keyboard and tape it to the monitor... (It would work on bigger screens to merely download a picture of a keyboard and leave it on the desktop. )
Then look at the picture of where the keys are instead of your hands as you type. Over time, it trains you to locate the keys by touch instead of by hunting and pecking for them. It's because looking at a picture of the keyboard is enough of a translation to allow all your fingers to be involved...because if you locate your whole hand over the keyboard, you just have to move less to get to all the keys if you use more fingers that two.
It helped me to think of my hands as having many pointers that cover the whole area of the keyboard, as if I was sort of a crab. This image was useful to me. I was thinking of my hand as being one single pointer, or having the ends of my hands occur in a single, claw-like tip.
Of course, this probably would not work for everyone, but it has worked for some people I knew personally.