Pre-service education the Ideal

I've just been reading John McCullough's discussion entitled, "Pre-Service Education, Social Networking, Not" and I figured that I'd ask a different question. I'm hoping that teacher educators would be willing to share the most effective lesson that they have ever taught, or project that they have assigned which prompted students, that is future teachers, to think about the use of Web 2.0 technology in different ways.

Please share!!

Andrew Pass
http://www.lessontech.blogspot.com