I got an e-mail from VMware Press notifying me of this sweepstake:

VMware Press, the official publisher of VMware books and training materials, has launched a 60 day Facebook sweepstakes beginning May 1 and running through June 30th. Prize offerings include a $100 Amazon gift card and three VMware Press books of the winner’s choice; nine second prize winners will win an eBook of their choice. Good luck – enter now!

Seems like a good way to fill up your (digital) bookshelf!