National Center for Biotechnology Information (NCBI): http://www.ncbi.nlm.nih.gov/
BLAST: http://www.ncbi.nlm.nih.gov/BLAST
BLAST-Human Genome: http://www.ncbi.nlm.nih.gov/genome/seq/HsBlast.html
Locus Link: http://www.ncbi.nlm.nih.gov/LocusLink/refseq.html
PROW: http://www.ncbi.nlm.nih.gov/prow/
PubMed: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi

Human Genome Project (USA):
NIH: http://www.ncbi.nlm.nih.gov/genome/guide/human/
DOE: http://www.er.doe.gov/production/ober/hug_top.html
UCSC: http://genome.ucsc.edu/goldenPath/hgTracks.html
European Molecular Biology Laboratory (EMBL): http://www.embl-heidelberg.de/
European Bioinformatics Institute (EBI): http://www.ebi.ac.uk/
Ensembl (Sanger Center, EMBL, EBI): http://www.ensembl.org/

Model Systems:
Arabidopsis thaliana: http://stein.cshl.org/atir/
Caenorhabditis elegans: http://elegans.swmed.edu/
Drosophila melanogaster: http://edgp-dev.ebi.ac.uk/
http://www.fruitfly.org/
http://flybase.bio.indiana.edu/