To all who looks at the debris photos:
When you see many adjacent part in context, then you can often tell what may or may not have happened. The photo of the relatively intact airplane window panel can not be taken out of context. It there are more debris found you can start making deductions.
The debris found shortly after the AF447 crash showed similar characteristics, and that was high velocity impact with the ocean. The cruise-level destruction of MH17 resulted in much smaller pieces (apart from engines) and fragmented bodies.
If several pieces of debris turn up rather undamaged like on the photo, a scenario where the plane hits the water with minor or no external damage MAY be what we're looking at. Reference the popular AF447.
If several pieces of debris turn up that are small and shattered you are more likely to have an in-flight break-up like Air India 182 (also a water event).
Please remember that even in the cases of Lockerbie and MH17 (debris on ground, not water) there are several pieces that are somewhat large-ish and undamaged so there are huge pitfalls in trying to guess from only one photo of debris.
So, can we move on from that window panel now?
Please continue to post photos of debris as they turn up though, I follow this thread more closely than any other news outlet.