LEARNERS EDGE, a developer of online professional development and accredited training programs for K-12 teachers, has been acquired by L Squared Capital Partners. Terms of the deal were not disclosed. Founded in 2002, Lakeville, Minn.-based Learners Edge offers more than 80 courses through which teachers can earn transferable credits and degrees. L Squared Capital Partners is a private equity firm whose education portfolio also includes eInstruction and Teaching Strategies. More details in the press release.