Another point of light, this time the Connecticut Attorney General:
http://www.walletpop.com/2010/08/04/...-fixing-probe/
I'm not sure I would have included Amazon in what might eventually bridge from an investigation into a lawsuit, seems like it got dragged into the Agency model kicking and screaming, but Connecticut is where a lot of the NY based publishers live, so they'll probably said "The Devil made me do it" (price fixing). The devil to them is of course Amazon. So it could get interesting...
Still, I see this playing out more for the free market lawyers in private practice. The AGs are in it partly for the politics, it plays well for them (big companies taking from the small, defenseless consumer (aka the voter)), but the financial benefits accrue more to the big-Tobacco type lawyers.