This book constitutes the refereed proceedings of the 3rd International Conference on Human.Society@Internet, HSI 2005, held in Tokyo, Japan in July 2005.The 32 revised full papers and 9 revised poster papers presented were carefully reviewed and selected from 118 submissions. The papers are organized in topical sections on services, wireless networks, security, internet applications, information retrieval, medical applications, multimedia, Web retrieval and applications, and e-learning.