As you have discovered, Mac OS X uses Library folders to store and recover data. The user domain’s Library folder (~/Library) collects personalized support files, while the local domain Library folder (/Library) contains items used in a more global way. Within each library are folders that contain many types of materials, including preferences, licenses, plug-ins, and so forth. Many of the folder names overlap and can be found in both the user domain and the local domain.
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lsAddress Book Plug-Ins FontCollections Printers Application Enhancers FontFavorites.plist QuicKeys Application Support Fonts Recent Servers Assistants Icons Safari Audio Images Screen Savers Bundles Indexes Scripts Caches InputManagers Services Calendars Internet Plug-Ins Snapz Pro X ColorPickers Keyboard Layouts Sounds ColorSync Keychains WordService.service Colors Logs iApps Contextual Menu Items Mail iDVD Cookies Page Sender ...