QualiaSoup has some great videos, although many of them are in the excessively tired "trying to convince Christians that their religion isn't right" genre.
edit: Perhaps that's not the best name for the genre; it's more a kind of rational argumentation against ideas floating around the Christian memeosphere. But I'm still skeptical that it does very much good.
The internet is full of atheists who grew up Christian.
As someone who took way too many whacks to the head to come around, I can tell you, it's doing good.
An interesting little Flash-like video on "openmindedness" by someone named QualiaSoup (hopefully ironically).
Does anyone know how much effort is required to produce this sort of video, perhaps from a script? We need at least another thousand of these.