http://blogs.msdn.com/b/roncain/archive/2012/04/12/tracing-in-asp-net-web-api.aspx

http://blogs.msdn.com/b/roncain/archive/2012/04/12/tracing-in-asp-net-web-api.aspx

http://www.asp.net/web-api/overview/testing-and-debugging/tracing-in-aspnet-web-api

http://blogs.msdn.com/b/roncain/archive/2012/08/16/asp-net-web-api-tracing-preview.aspx

http://www.strathweb.com/2012/11/realtime-asp-net-web-api-tracing-with-signalr/

https://github.com/azzlack/Ninject.Extensions.WebApi.TraceLogger

https://github.com/dbettin/webapi.nlog

Using Tracing in ASP.NET Web API