I haven't eaten there, but Allears has a menu for Cool wash (as of October, 2011) that does include pizza:
http://allears.net/menu/menu_cwp.htm
I also recall Via Nappoli in Italy having a CS option serving slices, either right inside the entrance, or right outside. At the moment, however, I can't find a link to it. Perhaps, a more astute Diser can confirm (or deny).