My tip to improve your typing speed is to try to type so fast with out looking at your keyboard. thats what i do :D

<a href="http://keyhero.com/profile/akayai400hunna/?ba" title="akayai400hunna's typing test profile"><img src="/static//badges/680/typing-test-204157.png" alt="akayai400hunna's typing test WPM" style="vertical-align:middle"></a>

When my fingers hurt after too much time on the keyboard, I Do nothing. Just Keep typing and playing.