Question about how people process information

Oh great wise and wonderful friends list, I have a question. I have had this bouncing around in my head for some time now but my paltry layman's research skills have left me without answers. Between the students and the teachers and the librarians and the generally smart people on my friends list I'm hoping one of you can help me.

Basically, I'm wondering about the way people process information, and what the differences might be between handwriting and typing/keyboarding. I figure someone has to have done a study at some point, at least one, but I can't even find any reference to the idea. Can someone out there toss me a clue? Thanks regardless!