EXHIBIT D JOINT FILING AGREEMENT The undersigned agree that this Schedule 13D, dated September 16, 2005, relating to the Common Stock of YP Corp., shall be filed on behalf of the undersigned. Dated: September 16, 2005 Grand Slam Capital Master Fund, Ltd. By: /s/ Mitchell Sacks ------------------------------------ Name: Mitchell Sacks Title: Director Dated: September 16, 2005 Grand Slam Asset Management, LLC By: /s/ Erik Volfing ------------------------------------ Name: Erik Volfing Title: Member