I tend to type with just one hand a lot of the time. I've trained with touch-typing software, but I never managed to learn to type all that quickly. My "one-and-a-half-handed" typing is about as fast as I've ever gotten when trying to touch type properly, so I haven't bothered to try to practice more. (I think I do about 30 WPM.)

My father, on the other hand, is a 62-year-old engineering professor who still can't type with more than two fingers. When he tried to get tech support from a chat room once, the support guy kept asking if he was still there.