On Tuesday the 22nd of May, I'm giving (gave) a presentation at the CT .Net user group on the implementation and use of dynamically loaded services based on the WCF framework.  I'll put some more detail into this in a bit, for the moment

Presentation - http://www.vibrant3d.com/blogs/DSPresentation.zip

Source Code - http://www.vibrant3d.com/blogs/DynamicServices.zip