I'm asking these three familiar questions...
1. What is a blog?
A forum. An online journal. A hang out space. Like a coffee shop online. It can be interactive. Blogs are topic specific. You could be anonymous.
2. What is the read/write web?
You can read something on the web and respond to it. Would it be opinions or substancial information? Would wikipedia be part of that? What about email?
3. What do these technologies mean for your students?
Learning continues outside the classroom. Instant gratification. Pen pals in other countries w/ instant communication. Problem solving with peers not in the classroom.