.NET RIA Services, IronRuby alternatives?

I have just been checking out the docs from the .NET RIA Services July
2009 preview:


It seems pretty complicated, and there is a lot of magic (shared files,
attributes, generated code - with more attributes in it)

Since dynamic Silverlight already exists, I was wondering if anyone has
had success using a simpler approach using that?

Specifically, I am looking to enable simple CRUD against a db backend
using Silverlight.

I would imagine that using REST/Sinatra would result in a much much
simpler, but arguably equally effective solution for Silverlight apps.
(.NET RIA Services does seem to have some nice (but not intuitive) stuff
for validations though)

Anyone already trying .NET RIA Services and/or Dynamic Silverlight?