A little bit of information for anyone that might have bought the new Kindle (Talking about the $79-$109 one. Don't know if this will apply to the Touch or not):
Like the Nook it refreshes the screen every 6 page turns. Doing that eliminates the black flash you get with a page turn (Except for every 6th one). But some people say they can see ghosting because of it, a slight afterimage of the previous page behind the current one. If you don't like it Amazon has a solution.
This update works differently than others in that you have to download it to your PC and then transfer it to your Kindle via USB. It adds a new option in your settings that allows you to instruct your Kindle to refresh with every page turn like the older models did.