Last week, Alexandra Juhasz contributed a guest piece reviewing her experimental efforts to make YouTube an effective teaching tool. And it didn't take long for the web to take notice. Soon after we posted her review, The Wired Campus (Chronicle of Higher Education) took an angle on the piece. Next, the venerable Ars Technica used the post as a springboard for its own summary. And finally, that story soon reached the homepage of Digg.com, which inevitably meant that Alexandra's piece got picked up by umpteen smaller blogs. It's always fun to watch the ripple effects of the web go through their motions.