What's your typing speed?

I took several tests ranging from 1 to 2 min from http://www.typingtest.com/. My speed is close to 48 wpm. How to improve this? Interesting.
I also used backspace quite a few times. I remember my colleague Rajesh Seenivasan typing without pressing a backspace. Now, that is something I took up as a personal challenge and was able to get past many backspaces, but there are a few more to trim :-)