I pre-ordered a pink PRS-350 from my local Waterstones store in the UK, and they told me that it would be available today to collect. Got to the store at lunchtime, and the assistant (very apologetically) said that the PRS-350's were supposed to be delivered today, but they had inexpicably not arrived with the rest of the delivery. He said he thought it was potentially a Sony problem, as they'd had no word from their HQ as to why they hadn't arrived, and that up until the delivery had arrived they still thought they would be arriving today. He'd rung a couple of other local branches and they were in the same boat.
They'd even half-built the display - Waterstones were taking pre-orders for the Black/Silver PRS-650, and Black/Pink PRS-350 and they only had display boxes for the Black PRS-650 on the shopfloor, along with a few folorn accessories.
The Waterstones website is now showing the Black 650 and Silver 350 as immediately able to ship, but the Silver 650 and Pink 350 as on back order, ready to dispatch in 2-4 weeks. So I have no idea when I will eventually get my reader - the assistant said to try ringing the store next week, but I don't think I'll get my hopes up until Waterstones online presence is showing actual stock.
And don't even get me started on my local Sony store - on Tuesday at least they had no idea when/if they would be getting any stock.