[Jim] Balsillie, chairman and co-CEO of Research in Motion, the company based in Waterloo, Ontario, that makes the BlackBerry, has emerged as the latest frontrunner to buy the Penguins, two sources with knowledge of the sale process said yesterday. His second pursuit of the hockey team is the latest development in what has been a roller-coaster ride the past several months as fans have waited to see who buys the club and whether the new owner intends to keep it in Pittsburgh. Balsillie, who has declined comment, was the secretive Canadian bidder who nearly signed a letter of intent with the Penguins in mid-July. He backed out when he realized it wouldn't be simple to move the team. It's believed he wanted to relocate it to Hamilton, Ontario, which is near Waterloo.