Does anyone know of a Twitter service proxy in particular, or a general-purpose REST service proxy that I could install on my own server, written in C#?
The point here is to direct Twitter service queries to my service that are passed-through to Twitter.
Check out this project on codeplex LNQ to Twitter, it might be of some help.
This actually turned out to be very simple with an ASP.NET MVC application. I'm using a ControllerAction that accepts a POST and the URL to request as a parameter. A jQuery $.ajax() call sends the request to the Action. The ControllerAction opens a WebRequest to the URL passed in the POST, and forwards the result back to the client using Content().