Everything about primer design    www.invitrogen.com, www.applied-biosystems.com
Make specific primers: http://frodo.wi.mit.edu/primer3/
http://www.ncbi.nlm.nih.gov/tools/primer-blast/index.cgi?LINK_LOC=BlastHome;
Cell line repository, hybridomas for monoclonal antibodies http://www.atcc.org/
Lab protocols, general lab information   www.promega.com
General lab tools, restriction enzymes   http://www.fermentas.com/; http://www.neb.com/;
In situ gene expression maps of most mouse genes http://www.brainatlas.org/
USCS Genome Bioinformatics http://genome.ucsc.edu/index.html?org=Human&db=hg17&hgsid=183046285;
SDSC Biology Workbench http://workbench.sdsc.edu/
NCBI mouse genome resource http://www.ncbi.nih.gov/genome/guide/mouse/

Animal resources:

Charles River laboratories   www.crl.com
VetMed Uni Wien, Institut für Labortierkunde   www.vu-wien.ac.at/labortierkunde
International mouse strain resource http://www.informatics.jax.org/imsr/index.jsp
Published cre mouse lines database http://www.mshri.on.ca/nagy/Cre-pub.html
Everything about mice and their handling http://www.paperglyphs.com/wmc/domain_lab.html

Databases / Literature / Networks:

National Center for biotechnology Information - GoPubMed ! http://www.ncbi.nlm.nih.gov/pubmed/
ISI Web of Knowledge:  www.isiknowledge.com