Amazon has recently announced that they will no longer be listing free Kindle edition books on their Kindle best seller list. The use of separate free and priced bestseller lists will make it clearer which books sell in volume based more on appeal than price point.
The change may reduce the promotional clout of free editions somewhat, but a more serious obstacle would be the Amazon-gatekeeping of free Kindle content. Despite the existence of a distibution agreement, Amazon continues to be spotty in their uptake of ebooks from Smashword-- and the reportedly refuse to list their free content at all.
There are arguments that Amazon should not have to carry free books and so be required to cover their nominal wireless cost for download. However they are hosting free books for large presses, so why is this reasoning applied only to small presses and self-publishers whose works, realistically, probably represent a smaller download burden?