http://www.genome.gov/

The National Human Genome Research Institute provides a listing of Genomic and Genetic Resources on the World Wide Web. Included are links to,

General Resources
Genome Mapping Databases
Sequence Databases
Structure Databases
Genome Centers - U.S.
Genome Centers - International
Chromosome Maps - Human
Chromosome Maps - Other Organisms
Medical Genetics
ELSI and Genetic Education
Selected Journals