MVP and frequent conference speaker David Rook, better known as SecurityNinja, gave an interesting presentation on security at Bsides London 2012. The chosen platform for discussion? Windows Phone. Rook goes into detail (it's an hour long presentation) about app and platform security. The talk covers Visual Studio, compiling code and how apps are ran within the OS.
While it's a fairly lengthy video, the talk is well worth checking out if you're interested in Windows Phone app development and security, or are wanting to know how everything works behind the doors.