Tomek

Writes in the slidebar the numbers of your posts

Post-counter

Writes in the slidebar the numbers of your posts

Krigus

Plugin WP Views Counter is counting views of pages or posts in your blog
In Edit Post screen plugin shows views of current post
You can manage settings of plugin in Settings->Page Views screen 
Plugin settings: 
* Post types, in which plugin is counting views 
* Show additional statistic for authorized users in admin panel or no
Plugin creating widget, in which users can see the most viewed posts of the blog 
Widget settings: 
* Widget name 
* Posts count – count of posts in widget 
* Show numeric value of viewsin widget or no

WP Views Counter

Plugin WP Views Counter is counting views of pages or posts in your blog

Post-counter vs WP Views Counter