As of May, 1990, the most comprehensive 32-Bit QuickDraw documentation is
distributed by APDA: "Macintosh System Software 32-Bit QuickDraw" -- Apple Part
#M0572LL/A. It contains an updated and expanded version of the materials
distributed at the May 1989 Developers' Conference.
(Note that numerous other Technical Notes discuss 32-Bit QuickDraw programming
issues, but they are usually more specific to writing code.)
In general, APDA is an excellent source for such information. If you are an
Apple Partner or Associate developer, you will have access to information via
their monthly mailings, including such resources as Phil and Dave's Excellent
CD.
For more information, search under: "APDA"