Hey guys--I don't have enough time to go into this in a lot of detail and I won't be back to answer questions for a while, but...
I wrote a negative review on Amazon detailing my color blob problems. A rep (identifying as Kindle support) called me ten minutes ago or so (an 877- number) and said the engineers are interested in the problem and would I ship one or both of my color blob units to them. They're going to generate me a new return label for PW #1 (which I hadn't shipped back yet). I assured them I'd love to help any way I could and that I hated giving them a bad review (true, I order most of my life through Amazon), and that I'd get it shipped out tomorrow.
Regarding PW#2, the rep did not want to promise me that a replacement right now would be problem-free, so I'm holding on to it for the moment. She said she'd email if they figure things out for certain.
So: no guarantee of an acceptable unit yet, but forward momentum. This also reflects the claims made on the other forum that Amazon is investigating at least.