Social location pioneer, Loopt (these guys were offeirng location check-in prior to foursquare I believe) are officially announcing Loopt star, a social checkin loyalty rewards program, at WWDC on June 7th. Loopt is encouraging users to Check into WWDC or ROE with Loopt Star on iPhone (www.loopt.com) and show check in at the door for free entry.
Loopt officially blogged about Star last week HERE where they described the addition of loyalty rewards for users (similar to badges and points that others can earn on foursquare and GoWalla) as achievements and real rewards from some of your favorite brands, like special offers, discounts, and free music. Some of the brands on board at launch include Starbucks, Stanford U, and the Gap. More info available at http://www.loopt.com/looptstar See also Loopt on facebook http://www.facebook.com/Loopt