This book constitutes the refereed proceedings of the Second International Symposium on Handheld and Ubiquitous Computing, HUC 2000, held in Bristol, UK in September 2000. The 18 revised full papers presented were carefully reviewed and selected from 70 submissions. The book offers topical sections on intelligent environments, user experience, multimedia augmentation, location-based services, context-aware messaging, intelligent devices, infrastructure engineering, and wearable computing.