Daring Fireball’s John Gruber has posted a piece titled “ Microsoft’s Long, Slow Decline .” As with most of what he writes, it’s both provocative and thought-provoking, whether you agree with all of it, some of it, or none at all. Gruber writes about such matters as Microsoft’s recent lackluster financial results , the recent news of Apple’s utter domination of the high-end retail PC market , and the cartwheels Microsoft COO Kevin Turner supposedly turned in the hallway s over Apple’s respo