GRAPEVINE, Texas (AP) ¿ Videogame retailer GameStop Corp. said Monday that its founding chief financial officer, David W. Carlson, will retire effective March 1, 2010. Catherine Smith, previously executive vice president and CFO of homebuilder Centex Corp., joins GameStop immediately as Carlson's successor. Carlson, 46, has been with GameStop since its inception in 1996. He will assist with the transition. Shares fell 57 cents, or 2.5 percent, to close at $22.56.