The default locations for various config files and data directories, by default, under Mac OS 10.4:
Apache Web Server*: /private/etc/httpd/httpd.conf
MySQL*: /private/etc/my.cnf
To be added to as time permits.
* Editing these files requires you to be logged in as root, or use the sudo command.
Yes, I know that ‘short treatise’ is somewhat of an oxymoron, and I am also aware that this post is, in fact, not a treatise at all. So?