www.sdlookup.com Or, if you

[djrobsd]

http://www.sdlookup.com

Or, if you know the APN or the address, you can go to http://arcc.co.san-diego.ca.us/services/propsales/propsales_search.aspx

Also, this guy maintains a list..

http://users.ixpres.com/~gtriphan/