Linux/UNIX Migrator's Guide?

I haven't seen anything in particular.

You can activate root and set a password through NetInfo Manager in /Applications/Utilities in the security menu. You have to authenticate with your administrator password first.

Preferences are stored under your user area, usually in Library/Preferences but application options are also stored under Application Support.

 

Sorry, don't know about any such FAQ or guide (maybe someone else will), but I can answer your questions.

OS X ships disables the root account by default for security purposes. Any admin account can use 'sudo' so you're never completely locked out. If you want to enable the root account: http://docs.info.apple.com/article.html?artnum=106290

Your prefs are stored in ~/Library/Preferences/. Not familiar with the .mozilla folder - what's typically in there?

edit - bous' beat me by 2 minutes.

 

Folders and files that start with . are hidden in Finder. You can see them with Terminal by doing a 'ls -al'.
System-wide preferences are stored in the /Library folder.
User Preferences are stored in /Users/username/Library

I used google a lot, and i figured things out after a short while.

Lee Tom