Displays in a Widget your most visited Posts. It also works with Pages, and Custom Post Types.
Pop! Popular Posts for WordPress provides you a way to show your most visited posts, pages, or custom types, using a Widget.
Every time that one visitor loads a post, your database will update the count for that post +1. That information can be shown within a Widget, that allows you to set how many entries do you want to show in the list, the post type to show, and show or hide the views count.
If you are a developer, and want to recover the popular posts into your theme/plugin, you can use the function "pop_get_popular_posts($num,$type,$order)", where $num is the number of posts you want (default: 5), $type is the post type (default: post), and $order can be "DESC" for a descendant list, or "ASC" for an ascendant list. This function returns an Array of WP_Post Objects.