ApprovalTests for .NET - seems crazy, but there's a point...
To be honest, I haven't heard about ApprovalTests [http://approvaltests.sourceforge.net/] library until just few days ago, when I've spotted a new course on Pluralsight [http://beta.pluralsight.com/] - Approval Tests for .NET [http://beta.pluralsight.com/courses/approval-tests-dotnet]. But the concept seems interesting...