OpenFeint announced that it is launching a single sign-on system for social developers on iOS. It is similar to the UDID that Apple intends to phase out, and will convey similar benefits from accessing a user’s history, tracking their behavior, and offering cross promotions.

“With the deprecation of UDID, social game developers need access to a universal method for identifying and delivering services to their users,” said OpenFeint founder and CEO Jason Citron. “Available to 115 million gamers at launch, OFUID will offer that reach and improve on it by giving users a way to share information with game developers, if they so choose.”

“Sign-on with OFUID is incredibly flexible and has been designed to reduce sign up friction for games,” said added senior vice president of product Ethan Fassett. “Developers will be able to make sign-on optional at first launch and can display it later if they choose. Game developers will also be able to incentivize the sign-on process, offering users rewards for signing in or setting up accounts.”