This is a great video by a Revert Brother from Canada.

Part 1: http://www.youtube.com/watch?v=w01XUfu_wVo
Part 2 http://www.youtube.com/watch?v=s18FnNgk-h8

He explains Monotheism in Islam, and the meaning of "Tahweed" in Islam.
This guy is super smart, I bet hes going to be a scholar, masha allah smile