“MUrl” is a textual DSL and runtime for interacting with REST/HTTP services. It is actually just a great Oslo-DSL sample, as you can download it (all its source code) from MSDN.com: http://download.microsoft.com/download/4/0/B/40B632EC-F201-43EE-8E29-C398A9DA8468/MUrlSample.msi
