Hey, I think this is a good post. People should always share knowledge and experiences.
Incidentally I was looking for videos that show defense and submissions from the guard. Submission 101 has some great attacks from guard but I like this particular video for one 2 reasons.
1. It shows an easy and basic defense that is quick to remember and easy to practice.
2. It emphasizes on taking least damage as possible.
http://www.youtube.com/watch?v=nAGp2pXMieA