This is one of those issues that tends to keep flanking me but I've yet to really dig into. Thanks for your post, I will use it as a hop off point to start the information gathering. Just today, in fact, my wife was listening to Matt Landman ("Frankenskies") speak on the Meria Heller podcast. We were planning to watch it this evening to start the exploration but other things, as they do got in the way. Have you seen "Frankenskies"...if y, is it a good summary of the issues?