Yeah, I figured since you didn't see Walt Jr. and Marie at the house that I was wrong and it was just some random crash victims (and Gilligan confirmed that).
This has been a great season. I had a feeling we would not know exactly who is in the body bags in the finale. I must have missed it when Walt said "which one?" when asked where his cell phone was, and only knew about it when Skylar confronted him after the surgery.
I do see Walt as a tragic figure, kind of like Macbeth. Both of them started out with ambitions, which would get the best of them, and cause them to go off the deep end and commit murder.
Also, seeing Walt's picture held under the Wanted sign, as Hank was holding the jar, just telling where it began for Walt, and how far it has gotten.
There really is a "Save Walter White" web site as seen in the show... when you get to the "donate now" button, it takes to the National Cancer Coalition web site.