Fox embraced a radical thought when it outlined its Digital HD initiative earlier this month: customers are more likely to buy digital movies if the content isn't artificially delayed and priced to match the releases on conventional discs. The studio is about to see if that gamble on common sense pays off. As of today, you'll find 600-plus Fox movies ready to buy or rent in HD across every major digital video store in the US, with many downloads cleared to arrive ahead of their ph