There's also Designing the Mobile User Experience by Barbara Ballard: http://www.wiley.com/WileyCDA/WileyTitle/productCd-0470033614.html Not out until April, but excerpts are on her site: http://www.littlespringsdesign.com/ Dan Saffer book http://www.designingforinteraction.com work http://www.adaptivepath.com site http://www.odannyboy.com