Typos is an online training system that teaches you how to type faster
In addition to the easy-to-use interface, the trainer remembers your wrongly entered words as well as keys and exercises them more frequently.
The lections will teach you touch typing step by step. After that, you are perfecting your skills with the aid of the training and your own excersices.
You can always track your progress in the statistics. Currently, Typos saves your speed as well as your error rate and XP.