As reported by MacRumors.com:
Apple previously trademarked the term "Mac Pro" in New Zealand in late 2005. On May 17th 2006, the same name was trademarked through the U.S. Patent and Trademark Office.
This adds further evidence that Apple may be considering changing the name of the PowerMac G5 to "Mac Pro" in the near future. Apple rebranded the PowerBook in January to the MacBook Pro and subsequently dropped the iBook name in favor of MacBook.
Steve Jobs had indicated that they were moving away from the "Power" name when the MacBook Pro was first announced:
"It's a new name [MacBook Pro] because we're kinda done with 'Power' and because we want 'Mac' in the name of our products."
Interesting ... I want to see if Apple is consistent and asks Mac-Pro of California (an independent Apple reseller) to relinquish the name.
According to Apple Naming Policy:
1. Company, Product, or Service Name: You may not use or register, in whole or in part, Apple, iPod, iTunes, Macintosh, iMac, or any other Apple trademark, including Apple-owned graphic symbols, logos, icons, or an alteration thereof, as or as part of a company name, trade name, product name, or service name except as specifically noted in these guidelines.
It will also be interesting to see if they [Apple] try to purchase another site called MACPRO.COM (Makeup Artists Cosmetics).