Adobe Flash Builder for Force.com is a new development tool for building cloud-based, rich Internet applications (RIAs) that can be deployed in the browser or on the desktop leveraging Adobe AIR.
Flash Builder for Force.com includes capabilities for building Flex applications that connect to services and data in the cloud leveraging the scalable Force.com platform. It also adds new data synchronization capabilities for creating occasionally connected applications.
You can use Flash Builder for Force.com to extend or enhance existing salesforce.com implementations or to build entirely new RIAs deployed in the cloud using Force.com.