chrisnorthwood

Popular This Week is a plugin similar to Popularity Contest, but only records hits that happened in the last week. It then shows the most popular posts or pages in the last week as widget you can use in your theme.
It’s useful for high volume, high traffic sites where posts age quite quickly, and you do not necessarily want to direct your users to old content, but what people are reading right now. An example of the widget being used is here: http://www.nouse.co.uk/

Popular This Week

Provides a widget that shows the most popular posts in the last week.

LordPretender

Similar to the original native one, this plugin let you define the range of stats to retrieve. 
Also you will be able to add the category name of the post.
Finally, this widget will only display posts (and not pages too). 
This plugin read the top 100 of posts/pages and keep only the X first POSTS (X = number defined in the widget parameters). So, you can have less posts than requested.
Jetpack is required to work. 
A wordpress account and your blog must be linked.
You can find a demo here : http://www.spoils.fr/ 
The widget is named “Articles populaires” on the sidebar.

Jetpack Popular Posts

Using Jetpack stats, this widget will display the most popular posts.

Popular This Week vs Jetpack Popular Posts