I was just told that the latest edition of GNU/Linux Magazine in France is dedicated to PostgreSQL. A full 80 pages about your favorite RDBMS! I'm told all the articles are written by our own Guillaume Lelarge. Well done, Guillaume!
Unfortunately for those of us who don't speak the language, the whole thing is in French. But if you do speak French, it's probably well worth checking out. There's a preview available online, and the magazine should be available in stores. Guillaume has also told me the contents will be available downloaded later on, but not for a few months.