NCBI Web Resources
The NCBI Handbook.     An online guide to NCBI resources.
BLAST Traces. Search Trace Archive with MegaBLAST.
BLAST Zebrafish. BLAST your sequences against Zebrafish mRNA, EST, and genome sequences.
Clone Registry. Find information about specific clones selected for genome sequencing.
dbSNP. Database of SNPs and other genetic variation.
Entrez Gene. Focal point for genes and associated information.
e-PCR. Review in genomic context your sequence for sequence tagged sites (STSs).
FLcDNA Projects. View Full-Length cDNA Project summaries and links to resources.
GeneRIF. Gene References into Function. HomoloGene. View calculated and curated homologs for plant and animal genes.
Map Viewer. View and navigate among NCBI's suite of genome-specific Map Viewer and BLAST pages.
RefSeq. Reference sequences of mRNAs and proteins.
Trace Archive. Collection of raw sequence traces from various sequencing projects.
UniGene. Organization of transcribed sequences into gene-based clusters.
UniSTS. A non- redundant collection of STSs with links to maps, primers, and sequences.

FTP sites:
dbSNP
LocusLink
RefSeq
UniGene
Zebrafish Maps