There's currently no single reference for occam-pi, whereas there is one for occam 2.1. Fred Barnes suggested that we ought to figure out all the changes that have been made to the language and come up with a new reference manual.
Similarly, we could do with an "occam-pi Hacks" or "occam Design Patterns" book, showing lots of common things that you can do with the language.
(Note from ten years later: the "occam Design Patterns" book was essentially my PhD thesis — but we've still not finished the updated language manual!)