Art Republic
Famous Paris cafes.
http://www.artrepublic.com/wow/travel/paris/famouscafes.asp

Things To Do In Paris
Lists cafes by area.
http://www.thingstodo-paris.com/brochure/content.jsp?FIELD=Entertainment

Time Out
An online guide to bars, cafes and tearooms in Paris.
http://www.timeout.com/paris/bars/