The Amazon Appstore was spotted to be live, probably for testing purposes, yet it appeared neither finished nor functional at that time. Unfortunately, only two days after the revealing discovery, the page was made inactive, but while it was there it pretty much gave a general idea of what Amazon's software marketplace may have to offer once it is launched.
What may turn out to be a great advantage for Amazon is the fact that when compared to their Android Market counterparts, some of the apps may have a lower price tag attached to them. Only about 50 applications, among which a handful of exclusive video game titles, were listed for the time when the Amazon Appstore was exposed, yet we are expecting that number to grow rapidly after the marketplace's debut.
source: Android News via GSMArena