This site functions as a portal for a number of different databases/resources pertaining to biomedical and genomic information. While some of these databases focus on the scholarly literature (such as PubMed, mentioned above) many of them are instead tools to help you with tasks such as locating information on a particular DNA sequence or searching an organism's complete genome.
Sponsored by the U.S. Department of Energy Office of Science, Office of Biological and Environmental Research. This resource can be browsed by topic or organism, and it also contains a wealth of information on the Human Genome Project.
Created by the National Human Genome Research Institute (NHGRI) to help people understand the terms and concepts used in genetic research. Specialists in the field provide descriptions of terms, and many of these terms include images, animation and links to related terms.