This plugin can show the most popular articles in your sidebar, using data collected by Jetpack or WordPress.com Stats plugins.
IMPORTANT: this plugin has been abandoned!
If you are a developer and would like to fork, feel free to do so (under the GPLv3 license). No need to contact me.
WordPress.com Popular Posts lists the most popular posts on a WordPress powered site. This list can be used in the sidebar to show an indication of which are the most visited pages.
For further info visit plugin homepage.
Requires one of these plugins installed:
From v2.0.0, it requires WordPress 2.8 or greater.
You can follow the development on Github.