Blizzard Entertainment announces an exclusive World of Warcraft mount that can be earned via their Recruit-A-Friend program (thanks IncGamers). Complete details on the program can be found in the Recruit-A-Friend FAQ, and here's the summary from their website:

With the new Recruit-A-Friend program you can earn an exclusive Zhevra mount, receive a FREE month of game time, and gain access to other exciting in-game benefits. From the moment your friend creates a character and starts playing you’ll both earn triple the experience when grouped together and have the ability to summon one another from anywhere in the world. Also, for every two levels of experience your friend earns, they can grant one level of experience to one of your lower-level characters.