What the heck is ScrappyDB?
ScrappyDB is a code first style object mapping library and Linq provider for Amazon SimpleDB. Also included is an ASP.NET Membership Provider for Amazon SimpleDB.
ScrappyDB is personal project that is in use in a small number of low volume websites. It has been under intermittent development for several years. It is NOT a highly tested enterprise ready solution.
Check out the integration tests and the Sample MVC 3 website for sample code to help you get started.
SimpleDB is simple, it doesn't support relationships or aggregate functions, and as such there is a lot of Linq to SQL style functionality/syntax that will fail because it's just not supported by the underlying database engine...