If this could be used to build OData services URIs just like LINQ does in .NET when you reference an OData service, it would be the ultimate js library on the planet.

sorry, late a reply.

What kind of API do you image?

JavaScript's webrequest code is complicatedly. (multi browser for ie, fx, chrome, opera...)

I'm thinking JavaScript's network code entrust jQuery is better way.

A copy of the C# linq to rest (odata) functionality would be fantastic.

Then it would be trivial to get information and get the right odata syntax for the $filter parameter as an example (the hard one, the others are easy to do manually)