Amazon isn't one to provide a lot of specific numbers on the products and services it offers, but it has confirmed today that its $79 a year Prime service recently crossed a fairly significant milestone. The company says that more items are now shipped with Prime's two-day shipping than with its standard Free Super Saver Shipping -- which is, presumably, quite a lot. Of course, Prime has grown to become considerably more than just a premium shipping option since it launched in 2005, and Amazon has also taken the opportunity to divulge a few other details on the service. On Prime Instant Video,
