Hack Mac OS X Login Window
I am not sure why do you want to change the beautiful Mac OS X login window but, if you insist, you can refer to Apple Matters for tutorial to hack the login window.
Default Mac OS X login window:
Hacked Mac OS X login window:
[Read Apple Matters | Hack the Login Window]
My two cents
Erm… I better stick with default Apple logo. However, it is a nice hack for a public access mac, for example: computer in library or school lab. You can show your organization logo and add some custom messages.
Related book: Mac OS X Tiger Killer Tips (Killer Tips)
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