This plugin automatically imports WordPress.com stats data on a regular basis and integrates them in the WordPress database directly (as post meta data). It associates stats data with each posts and keeps on updating it over time. It keeps track of past data. This makes it possible to deeply integrate stats data with a blog core functionality. For example, displaying some view stats for each posts, or customizing WP query to retrieve posts while taking into account popularity, or dynamically creating new tags according to popular searches.
Since all available stats data is present in the local WordPress database at all times, the feature developer does not have to worry about building such data from scratch or querying it over and over from the WordPress.com API.