I've been reading scientific articles for the book I'm writing on stuttering, and yes, there is a very strong connection there; if you stutter you probably have ADD as well. Meditation is hard at first, but the longer you stick with it, the better it gets. Check out "Search Inside Yourself" by Chade Meng-Tan. It's a very modern, practical introduction to mindfulness and meditation, that still includes a lot of science.