Right now I'm playing with some back-end architecture towards the goal of making a Silverlight app. I don't know Silverlight, so guess what I'm going to be learning. :) The second goal of my current personal project is to be able to take what I create in Silverlight and do the same thing using WPF. Since Silverlight takes care of this, I'm doing this purely for the purpose of learning. I may drop this idea, not sure yet. I'm curious about several things, so deciding is the hard part. I may play with anything for a while just to see it work. Suggestions welcome.