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Plasmid Data Bank.
http://www.geocities.com/HotSprings/Spa/3013/plasmid.html
Swiss Prot List of restriction enzyme and methylase entries
http://www.expasy.ch/cgi-bin/lists?restric.txt
The Cloning Vector Collection, National Institute of Genetics.
http://www.shigen.nig.ac.jp/cvector/cvector.html
UniVec is a database that can be used to quickly identify segments within nucleic acid sequences which may be of vector origin.
http://www.ncbi.nlm.nih.gov/VecScreen/UniVec.html