I’ve posted some simple C# sample code for accessing RESTful UW web services. It takes advantage of the Microsoft WCF REST Starter Kit Preview 2 which makes the client code very simple. It covers using X509 certificates and processing xhtml responses.
This is just a first iteration and I would welcome any feedback or contributions.
You just need a UW netid for access: https://wiki.cac.washington.edu/display/AIS/CSharp+Client+Sample+Code