Building Communities in the Palm of your Hand discusses the ways libraries can become more pda/smartphone friendly, and therefore more user friendly.

This is particularly an important subject for health sciences libraries. PDA’s are very popular with doctors and when they need information they want it immediately with as little trouble as possible. My library constantly has trouble with both the doctors and students not being able to find journal on the the shelves, a tracking systen would cut down on a lot of frustration. But then there are the privacy issues…

Regardless, mobile device services are definately something to think about.