Just a quick tip. If your menubar crashes in OS X it can be restarted by typing a simple command in the Terminal.
killall SystemUIServer
You can also restart the Dock by typing:
killall Dock
or the Finder by typing:
killall Finder
All these commands are case-sensitive.
Changing file permissions on the Mac is something you need to know how to do if you want to create your own non-home directory only shares on the Mac. Leopard implements folder sharing similarly to the way SharePoints does. I find myself needing to change permissions regularly because certain programs like to change file permissions on their own. The Terminal is generally better for changing permissions because it is much faster and also because you have more control. Sometimes you may need to do this is the file permissions get messed up in Leopard’s File Sharing under System Preferences.
Here’s how it works: