Directory Structure - Library
The library - what does it sound like? A library. It's a library of resources. Since there are way too many subdirectories to go through in detail, I'll only go through the ones which might be relevant to someone in need of some hacking...
Application Support - These are some non-critical resources for apps such as Automator, Grapher, Mail, GarageBand, Microsoft Office, etc.
Desktop Pictures - These are desktop pictures; if you want to add some to the preloaded Apple Desktop Pictures for whatever reason, simply add the desired photos to this directory.
Dictionaries - If you want to add dictionaries to the dictionary.app, such as, for example, an IT dictionary or a foreign language dictionary, you must move your downloaded .dictionary files to this folder.
Fonts - You can add font files here. Note that the directory "Fonts Disabled" contains Times New roman, Verdana, Wingdings, Arial, and Brush Script - all windoze-y fonts. If you want to use them, simply move them to the Fonts directory.
Frameworks - Here are the frameworks for iTunes, AudioMixEngine, AEProfiling, AERegistration, AudioMixEngine, NyxAudioAnalysis, PluginManager, and other programs. They are filled with important files like libraries and supporting programs. More on this later; I don't understand them entirely.
Java - This contains basically all the important files needed for java to run. /Library/Java/Home/bundle/Commands and /Library/Java/Home/bin are two paths to where all command-line commands for java are located... Who knew there was more to java than just jar, java and javac?
Keychains - Keychains are here. More about keychains here: http://en.wikipedia.org/wiki/Keychain_(Mac_OS)
Ok, it's late and I'm sleepy; I'm less than halfway through, but I'll stop for tonight and continue tomorrow.
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