Yes! Sonystyle.com switched to "In Stock Estimated ship date: 09/10/2010" for the silver PRS-350! And then they canceled my order.
(Credit card authorization problem--I think it's because I tried to pay for part of the order with an American Express Gift Card. I'll have to use that for something else, I guess, and put the full purchase price on my regular card.)
(Update: And now my new order is ready for shipment, estimated ship date 09/10/2010. Awesome.)