For a quick introduction and recently added new features, check out the SpecFlow website first:
SpecFlow+ is an initiative to commercially support the open source project SpecFlow, ensuring its further growth and sustainability. If you enjoy using SpecFlow and want to support it commercially, you can buy a SpecFlow+ license. In return we provide you with additional tools that further enhance your productivity when working with SpecFlow.
SpecFlow aims at bridging the communication gap between domain experts and developers by binding business readable behavior specifications and examples to the underlying implementation.
Our mission is to provide a pragmatic and frictionless approach to Specification-By-Example for .NET projects.
SpecFlow also supports the concepts of Acceptance Test Driven Development (ATDD) and Behavior Driven Development (BDD), which are often used synonymously with Specification-By-Example.
The official website of the SpecFlow project is: http://www.specflow.org
Source code, wiki and issue tracking is hosted here on GitHub.
Discussions are on Google Groups: http://groups.google.com/group/specflow/
SpecFlow is sponsored by TechTalk.