The Internet is rapidly becoming a valuable source of information for all health care professionals, as well as for the consumers of health care--patients and their families and friends. Information on the Internet is uncontrolled and generally unevaluated. The quality filter of peer review, present in published dental journals, is usually lacking in Internet-based health sources. There are, however, a number of well-developed, highly-credible and useful resources available online that provide evidence-based information. In this paper, the third in a 6-part series on evidence-based practice, we discuss some of the sites that we have found to be most helpful for learning, teaching and practising evidence-based care.