The impact and effect of using for mobiles for learning can be a mixed bag. This recent publication (finally, :-) ) highlights some of the issues, most particularly the impact of learning design (particularly assessment), and students' perceptions of what may or may not be important for their learning. The paper has been ranked in the top 10 most accessed articles in September - really pleasing to know.
Vogel, D., Kennedy, D. & Kwok, R. (2009). Does Using Mobile Device Applications Lead to Learning?. Journal of Interactive Learning Research. 20 (4), pp. 469-485. Chesapeake, VA: AACE. Retrieved from http://www.editlib.org/p/29431.
The paper may be found HERE.
The students have the devices, use them socially and, to a limited extent, for learning. However, what is interesting is that the key issues of 'what will be assessed?', what instruments will be used for assessment?', and 'what are students' perceptions of what is important in learning?' are still constants. Comments welcome.