Integration into Prism was talked about in the 2.1.x time frame, we are @ 2.4.x, Prism 4 is out now and the RIStockTrader Example in /contrib is just a default XAML project.
Should it work? If so, anyone have a simple example of a Silverlight Shell + Bootstrapper + 1 Module they could point me to?
An updated Prism integration is currently in progress. I'm not sure what the status is exactly, but you can get the code and potentially contact the author here. You can also pass on feedback/suggestions/issues via the Autofac discussion group.