Reports have surfaced today that do-it-yourself mecca Home Depot will not be renewing its contract with BlackBerry, and will be replacing its fleet of 10,000 devices with iPhones. News of the shift sent BlackBerry stock into a nosedive, dropping 4.6 percent after the announcement. Home Depot did not say if the decision was made before or after the BlackBerry 10 launch, or when the initiative began.