Amazon released a new free app today, Amazon Instant Video, that gives U.S. iPad users access to Amazon's catalog of over 120,000 videos. It's great to see yet another rich source for movies coming to the iPad. If you're an Amazon Prime member ($79/year), you have access to thousands of free videos — a subset of their catalog, just as with Netflix. Of course, anyone, whether or not they're a member of Amazon Prime, can also purchase or rent videos (48 hours) for watching on their iPad.