Does anyone know of a library out there (preferably in C#) that will take classes and generate XML or flat files suitable for feeds to Amazon Marketplace Web Services?

In other words, I'd like to do something like this:

        var feed = new AmazonProductFeed();
        var list = new AmazonProductList();

        var product1 = new AmazonProduct();
        product1.Name = "Product 1";
        list.Add(product1);

        var product2 = new AmazonProduct();
        product2.Name = "Product 2";
        list.Add(product2);

        feed.Products = list;
        // spits out XML compliant with Amazon's schema
        Console.Write(feed.ToXml());

It looks like the only code Amazon provides are wrappers for the web service itself and the directory-based transport utility (AMTU).