Web 2.0 2

In my last blog post, I summarized my thoughts on Web 2.0 and how it could enhance the way we learn. As this week has progressed, I have been wondering why we haven't seen a big transformation in education as these new internet technologies have emerged. It is obvious that teachers are now beginning to utilize some of these tools in the classroom, but Web 2.0 technologies have been around for a few years now and are continually evolving. Shouldn't we be seeing some major trends in the classroom such as more computer-based instruction? As teachers, when trying to implement these tools, what challenges are we facing that hold us back from revolutionizing our instruction?