When in doubt, the code itself is the last word. In addition to this, each SDK has a read me file which lists changes, and from time to time, other documentation and technotes are released to cover new functionality. These will be rolled into the manual in due course. The MacZoop SDK is packed using DropStuff 5.5. Make sure you are using an up to date version of Stuffit Expander.
Some earlier versions do have problems.
However, it's a lot harder to use than CodeWarrior, being command-line driven. A new page detailing how to use MacZoop with MPW will be added soon. A. Join the discussion list. The announcement list is OK, but only absolute final releases get notified this way, and so that's pretty rarely. The discussion list gets notified of all version updates, even alpha and beta versions.