PE5_web 2.0 tools

Podcasts...everything I find says that they are a web 2.0 tool, but I don't see how podcasts are interactive where the listener/subscriber can respond. Isn't that what makes it a tool? I don't totally get it, but podcasts would be an interesting additions to a guidance program.  There could be topics that both staff, students, and parents can speak and offer thoughts, support and advice.  Then the archives would grow and grow and be available for incoming families, and honor students that have moved or moved on.  Considering the computers we received with Full Sail's program, this would be a fun, easy, and quick way to distribute information and could be a great intervention for my ARP. What do people think, web 2.0 tool or not? This could be really fun, and potentially be profitable long term, right?