Here are recent additions to The Best places to learn Web 2.0 basics list:
Educational Origami has several very nice printable Starter Sheets on using different Web 2.0 tools.
Here are several Common Craft videos that simply explain several Web 2.0 tools. I’ve mentioned these before, but it’s possible that these versions might be more likely to get through some school content filters.
Miguel Guhlin has put together an excellent collection of useful videos.