rationalskepticism.org

My personal favorite is Youtube's SoldierInGodsArmy. His account is no longer active, but there are mirrors of his video.

Here's some of his videos:
1. "I challenge atheists to ask Jesus if he exists."
http://www.youtube.com/watch?v=KKFuAzoKQdk

2. Genesis explained.
http://www.youtube.com/watch?v=I5S9A6OG ... re=related

3. Trinity explained.
http://www.youtube.com/watch?v=Zpu6rPEv ... re=related

4. Christians don't use circular logic.
http://www.youtube.com/watch?v=t2eTysgS ... re=related

6. Christian guide to debating atheists.
http://www.youtube.com/watch?v=DKpxiHft ... re=related

7. Stop taking the Bible out of context.
http://www.youtube.com/watch?v=W6DpM8EZ ... re=related

8. How Prayer Works.
http://www.youtube.com/watch?v=Qq34RPVP ... re=related

9. Evolution is a lie! Where are the unicorn fossils?!
http://www.youtube.com/watch?v=z-W88FBQuk4