This post I am compiling as a refernce material for me and other enthusiasts trying their hands on Windows Phone 7.
I want to start it by quoting first paragrpah of Windows Phone 7 book by CHARLES PETZOLD
Sometimes it becomes apparent that previous approaches to a problem haven’t quite worked the way you anticipated. Perhaps you just need to clear away the smoky residue of the past, take a deep breath, and try again with a new attitude and fresh ideas. In golf, it’s known as a “mulligan”; in schoolyard sports, it’s called a “do-over”; and in the computer industry, we say it’s a “reboot.”