Overview: Town Talk Diner (Minneapolis, Minn.) • Blue Plate Diner (Salt Lake City, Utah) • Broadway Diner (Baltimore, Md.) Guy Fieri heads for three great diners recommended by viewer e-mail, including a Baltimore family-run place with a huge menu, a Salt Lake City diner that's heavy on tattoos and 1940s décor and in Minneapolis, the diner run by a CIA trained chef