Ask these questions to get a sense for whether your source is reliable:
Academic Info: Anthropology
Contains links to websites concerned with many aspects of anthropology, including archaeology, cultural and social anthropology, linguistics, and many more.
American Anthropological Association
The primary professional society of anthropologists in the United States since its founding in 1902, is the world's largest professional organization of individuals interested in anthropology.
American Anthropological Association: Anthropology Resources on the Internet
Provides links to websites dealing with archaeology, ethnography, general anthropology resources, and more. Includes a list of email discussion groups.
Library of Congress's Ethnographic Resources related to Folklore, Anthropology, Ethnomusicology, and the Humanities
Provides links to general anthropology resources, journals and newsletters, archives and museums, and more.
Social Science Information Gateway: Anthropology
Evaluates and categorizes anthropology websites. For each website, there is a description, list of keywords, list of subjects, and a resource type (for example, organisations/societies, resource guides, educational materials, and so on).
WWW Virtual Library: Anthropology
Contains links to websites dealing with archaeology, cultural anthropology, specialized fields within anthropology, and more.