GameStop opened a record 210 stores during the first fiscal quarter of 2008, the company announced today. GameStop now operates a total of 5,400 stores worldwide, and said it plans to open between 550 and 600 new stores in 2008, half of them slated for outside the U.S. The first fiscal quarter brought strong results for GameStop, with earnings up 151.4 percent to $62.1 million, and sales up 41.8 percent to $1,813.6 million. The planned new store openings would grow GameStop's international s