To access the site you will need a Facebook login.
Included in the beta of the platform are blockbuster hits like CastleVille, Zynga Poker, Hidden Chronicles, and CityVille.
Says Zynga:
The Zynga Platform is designed with two simple goals: more access to the best social games and more people to play with. In a few days we're turning on a beta of Zynga.com which will feature our most popular games: Words with Friends, CastleVille, Zynga Poker, Hidden Chronicles and CityVille. Soon after, we will be adding great games from other developers too.Every day, we think about the challenges in enabling play. How can we surface more friends that want to help you build your bridge in CityVille? How do we help you find your perfect match in Words With Friends?
Zynga.com is designed to make it easier for you to play with friends. We're excited to offer new features like the live Social Stream which will enable you to play in real time with your friends and find new ones. Player profiles will let you check your friends? helpfulness score to see who's most likely to help you back. And you?ll be able to chat and play live with your friends and a community of players interested in the same games as you.
More info here: Zynga Blog