Meredith Farkas' book "Social Software in Libraries" has a chapter on the mobile "movement" and its relevance to libraries. It's a good overview and she points to some good resources.
Our staff editor (Sharon Streams) is also working on getting some of the mobile info presented at Internet Librarian posted here at WJ. I'll come back and post here when it goes up.
Thanks Dave for starting the conversation - obviously timely!