See "Features Supported in Silverlight for Windows Phone" on MSDN.
This is a analysis of the difference of the Silverlight API's with SL4, SL3 and the SL version on the phone: http://firstfloorsoftware.com/blog/the-silverlight-definitive-diff-lists.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.