Recent Books on the Topic
nM. Birnbaum (Ed.), Psychological Experiments on the Web.  Academic Press. (2000). nM. Birnbaum, Introduction to Behavioral Research on the Internet.  Prentice Hall. (2001). nU.-D. Reips & M. Bosnjak (Eds.), Dimensions of Internet Science.  Pabst. (2001).
n