(A confession: Brad Herring sent me a link to this video months ago and I carefully filed it away to include in a later blog post and in the newsletter. Then I forgot about it until Brad very graciously mentioned it last week. My apologies.)
Brad Herring  at the Museum of Life + Science  put together a great video about the work of North Carolina State University researcher Dr. Jamie Bonner  on the potential toxicity of carbon nanotubes.
Apart from being a generally very interesting and thoughtful introduction to some of these societal implications issues, the video could be a good lead-in to a nano forum or a science cafe discussing the risks and benefits of potential nano applications.
Check it out here: http://www.ncmls.org/learn-about/science-in-triangle/carbon-nanotubes 
And here are two interesting blog posts by Andrew Maynard  and David Berube  on carbon nanotubes, the asbestos comparison, and safety. You can also check out Dr. Bonner's website for more information: http://service004.hpc.ncsu.edu/toxicology/faculty/bonner/index.htm .