Reference

Develop - The Apple Technical Journal
Browseable archives of all issues of "develop", Apple's award-winning technical journal, published quarterly from January 1990 to March 1997.
http://www.mactech.com/articles/develop/

Gestalt Selectors List
An exhaustive description of gestalt selectors.
http://www.rgaros.nl/gestalt/

How to Program Your Mac
Comments from nearly 200 Mac programmers have been assembled here as a beginners reference to Mac programming.
http://www.13idol.com/mac/program.html

The MOST
The Mac OS Students and Teachers. Provides a way to learn about Mac programming by using tutorials and other guides on their site.
http://www.themost.org/

Quinn's Newbie Mac Programmer Hints
General tips about how to program on the Mac, most of them fairly obvious.
http://www.quinn.echidna.id.au/Quinn/WWW/NewbieMacProgrammer.html

Thomas Tempelmann's Mac Developer site
Information and tools about the Desktop Database, source code of a PascalLib that provides C-style string routines for Pascal Strings.
http://www.tempel.org/macdev/

USENET Macintosh Programmer's Guide
Questions and answers to Mac programming problems compiled from USENET extracts and articles.
http://mxmora.best.vwh.net/umpg/