Want to buy wife a new macbook for Christmas and want to transfer the data from her old one.

Is transfering all her stuff (itunes, email, contacts) easy to do?  
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yes.  Pretty easy to do.  You'll need to network the two computers either via firewire or ethernet.  USB will not work.  However, consider that her old black macbook may only have firewire 400 and her new computer if it's a macbook may not have firewire at all.  In that case ethernet should work.  If you set the computer up first with another user, then move the data later, you can always go back and use the migration assistant to do so.  

Let me know if you have any other questions.