Pogo just Tweeted this code for 20% discount:
Enter "facebookfans" at checkout for download-games.pogo.com
As a special thanks from the Pogo Download Game Center, we're giving you a chance to get any game of your choice for 20% OFF the regular price. Use the code "facebookfans" at checkout to receive your discount. (Offer valid now through 3/5/2010, on games priced $19.95 and above.)