On the IPad, I type with seven fingers, four on my left hand, and three on my right hand. For some reason, as I got faster and faster on the iPad, somewhere along the way, I stopped using the pinky on my right hand, and just hit the various keys out there with my ring finger.
Never really noticed it until a few months ago. A friend pointed out that even though I was touch typing faster on my iPad than they were on their laptop - that my form was terrible, as I was using the wrong fingers. I don't do that on a regular keyboard, so, maybe it's just part of the process of adapting to a smaller on-screen keyboard.
Anyway, practice makes perfect. Just type a bit here and there, and before you know it, you'll be typing as fast on the iPad as on a regular keyboard.
Oh, and all of my MacRumor posts are done on my iPad. (and I tend to write lengthy posts...) I also write a lot of work related documents on the iPad keyboard while sitting outside enjoying Hawaii's scenery. I really enjoy working on the iPad.