15 Free PDU's for Self Study

Any self study of books, magazines (like PM Network) , journals, blogs, newsletters, articles, videos or discussions that relates to or talk about any area of project management helps you get 15 PDUs per cycle (of three years).
This is assumed to be the most easy and convenient way of earning free 15 PDUs where you are really not putting any special efforts.
Just be sure to record somewhere whatever you have studied, for which you are claiming the 15 PDUs, for the purpose of audit.