MostPopular Feed allows you to create an RSS feed of the most popular posts on your site. It uses the statistics gathered and hosted on WordPress.com to determine which posts are the most frequently viewed, and then returns an RSS2 feed of those posts at yoursite.com/?feed=mostpopular
The feed’s output can be altered through query string variables:
includepages=1to include pages in addition to posts (default: off)
limit=10to control how many results to include (default: 10, max: 100)
duration=90to specify how many days in the past you want to use statistics for in determining top posts (default: 90, max: 90)
To use the plugin, activate it in the VIP Plugins area of your Dashboard.