Biology Department of Boston College
http://www.bc.edu/schools/cas/biology/

PubMed
http://www.ncbi.nlm.nih.gov/pubmed

NCBI Blast
http://blast.ncbi.nlm.nih.gov/Blast.cgi

A Plasmid Editor - free software for organizing plasmid files - great resource!
http://bioweb.biology.utah.edu/jorgensen/wayned/ape/

Primer3 Input Primer Design
http://frodo.wi.mit.edu/

Xenopus Xenbase site
http://www.xenbase.org/common/

Society for Developmental Biology
http://www.sdbonline.org/

ASCB
http://www.ascb.org/

Society for Neuroscience
http://www.sfn.org/