I used to be one of those. Until one day a colleague noticed and made a remark. Then I looked at other colleagues and realized my problem. I used http://www.gnu.org/software/gtypist/ to fix it.
I'm still trying, but it's demanding more discipline from me than I thought I'd need at first. It's hard to get rid of bad habits when they've already become muscle memory.
I actually learned to type mostly by playing text based games (muds [telnet elephant.org]). Having to type fast enough to not get killed by the monsters helped me learn. Of course alot of players just set up scripts or triggers in mud clients. I mostly used straight telnet to play.
I found http://play.typeracer.com/ a fun way to get my typing speed up. I originally just went there to play around with my shiny new mechanical keyboard (which turned out to be very nice to use) and then it replaced minesweeper for short mental breaks.
Admittedly, I was typing pretty fast before I started--I think I went from something like 80 wpm to 110. But it was certainly fun!
As an aside, I've found short mental breaks like that really help when I get stuck on some little issue or bug and am not making any progress. It also keeps me from getting too frustrated!
I'm in college taking some CS classes and the actual material is great, but the framework code they give us for projects is really poorly written Python. I've spent more time grappling with Python and their code than I have with AI or compiler concepts! Taking a break whenever I encountered yet another stupid bug helped me avoid spending hours going in circles.
