Typing speed is the most important factor in computer documentary work.You have to type many words everyday.But type mistake and looking on keyboard and screen both wastes a lot time.
Touch typing technique is divided in mainly two parts.Memorizing keys and Real time practice.For real time practice you can type out anything from a book or newspaper.You can use program like Typing Tutor.
To memorize keys you can use your memory power,but to test and practice memory one web application is there.
You can see the game The original keyboard challenge has blank keypad without keys and you have to fill keys at proper position.Such you can test you memory.
Practicing for some days you will be able to type using your sense and touch not by eyes watch.