WP Most Popular is a simple plugin which tracks your most popular blog posts based on views and lets you display them in your theme or blog sidebar.
WP Most Popular was born out of frustration in finding a decent plugin which performs one simple task and that is to rank your most popular blog posts.
The plugin keeps a log of your most popular posts based on views and lets you display them in your blog theme with custom styling. You can display popular posts from the last day, 7 days, 30 days or all time.
It also comes with a sidebar widget to let you display your popular posts on your blogs sidebar.
If you are a developer and integrate the plugin in to a theme, you will get a lot more flexibility out of the plugin including the ability to show the most popular custom post types etc.