Videos To Watch
The following are great videos made by smart people that help explain some of the concepts behind the social web.
First is "The Machine Is US/ing Us" from the amazing Michael Wesch. Michael manages to convey lots of complex and potentially geeky information in this watchable, and ultimately very moving, explanatory video.
Lee Lefever at Commoncraft has done a whole series of animations explaining aspects ot the technology behind the web and this one, "RSS In Plain English", is my favourite.