An interesting Open Access book:
Kroski, Ellyssa / On the Move with the Mobile Web: Libraries and Mobile Technologies / Library Technology Reports / 2008 / vol. 44, n. 5 / pp. 1-48.

http://eprints.rclis.org/15024/1/mobile_web_ltr.pdf (2912Kb.)

Includes chapters on the types of movile devices available today, Library Mobile Initiatives, How to Create a Mobile Experience & Getting Started with the Mobile Web. Also discusses potential uses of visual camera phone searching with those 2D QR barcode tags.
Predicts library adaptations including:
Students will be able to check out own books using 2D barcode readers in their own mobile devices and video conferencing with a reference librarian will be possible at the click of a cell phone icon (eg via Skype Mobile).

-Meg