Elmah.MVC (nuget): Painless integration of ELMAH functionality into ASP.NET MVC Application. Just drop the package inside your ASP.NET MVC application and access /elmah URL. It will also install global HandleError filter, that guarantees all unhandled errors are logged (even if customError turned "On").
Keywords: ELMAH|ASP.NET|MVC|error|handling|logging|unhandled|exception