Damian Schenkelman has an example on how to load modules that were packaged for remote module loading in a Silverlight OOB app.
Source: Damian Schenkelman's Blog
I created this sample a couple of months ago, and I thought might be useful for others. Here you can download the sample I put together using the Modularity QS from Prism 4. You can also download the necessary files separately (OOBModuleManager.cs and CachingXapModuleTypeLoader.cs)