I've been meaning to give RestSharp a go since I first started using Hammock in my startup project's codebase, just because I had heard some good things about RestSharp's auto-parsing capabilities.
This weekend I cobbled together a small example using del.icio.us' RSS feeds (not to be confused with its draconian REST API) for users and RestSharp performed magnificently, although its POCO -> XML Element mapping process requires a lot of experimentation before you get it just right.