This morning, a friend asked me about popular posts widget for Blogger platform. In the past I have tested some tools to create such widgets but unfortunately none worked well. Even up to now, I can't find a good method to easily create a popular posts widget.
First, you need to sign up to Google Analytics or other website monitoring service, which can show your popular contents. I suggest that free service from Google because it is free yet offering advanced statistics. There, you can get the top contents using this path: visit Google Analytics >> Accass Analytics >> View Report (on your blog) >> View Report (on Content Overview) >> View full report (on Top Contents).
You know folks, there is a time when you can't rely much on automatic widgets and you have to do something yourself manually to get it right. Let me know if you need further assistance :)