As the internet proliferates beyond the PC to myriad devices - from iPhone to smart-phone - anyone delivering digital products deals with complexity: varying form factors, cultural differences and contexts of use. In this workshop we explore the implications of this complexity, discover through collaborative experience where the pain points lie, and identify strategies for dealing with them. We conclude that the unique challenges faced in the design and development of mobile applications benefit from agile software development and its ability to cope with such complexity.