E. coli plasmid info - (Apr/17/2007 )

I'm trying to familiarize myself more with the various E. coli plasmids in common use. Are there any resources on the web that give a lot of plasmid info like origin, copy number, resistance, etc? For example, http://www.fermentas.com/techinfo/cloning/index.html has some of this info. But more specifically, I was thinking it would be cool, from a visual learning standpoint, to see a family-tree-type layout showing which plasmids are derived from which and the historical progression of their usage. Has this ever been done?