I want to try my hand at Postwork (just for the hell of it).

Now I don't want to hunt the web for good tutorials, I seek a comprehensive graphics resource.

There are two postwork eBooks in the RMP. Then there are websites like sijun with tutorials and forums. Hmm... but I would prefer a dead tree book like Digital Fantasy Painting from Michael Burns.

So, what postwork resources (websites, tutorial compilation, books) can be recommended?