Jason L. Miller from WebProNews has posted an interview with Jeffrey P. Hermes (why do lawyers always have middle initials?), a partner in Brown Rudnick's litigation department.
The article is a nice primer on the differences between slander and libel and contains a pretty lengthy piece on how libel plays out in court. Now, this article is American, but I would wager that the points are still good to know for all of us. I don't think I really understood the difference between libel and slander, but I now have a much better idea of where I should draw the line.
Hermes notes that there have been no podcast libel cases brought before the courts yet, but he also predicts that will change rather quickly.