Mobile Assisted Language Learning (MALL) continues to benefit from many software and hardware innovations. Mobile devices are becoming more powerful, more flexible, and more available. Unfortunately, a large bulk of the implementation studies fall outside of the general academic areas (conferences, dissertations, journals, etc).

Check out this article from Jack Burston in Language Learning & Technology. (mirror)
He did a great job compiling an annotated bibliography for all of these harder to find MALL studies.

Excerpt:

Though a young field, some 575 works relating to MALL have been published over the past two decades. The topics covered are varied and include considerations of technical specifications, mobile device ownership, pedagogical design, learning theory, user attitudes, motivational effects, institutional infrastructure, and teacher training, among others. By far, the most frequently occurring type of MALL publications are project implementation descriptions. Based on the references contained in the works themselves, they account for nearly 350 of the total, some 60%. These references are the focus of this bibliography.