Although the biggest part of Plugin Rank is tracking and reporting plugin positions in search results, being able to see how your SEO improvements and rising rankings actually help increase plugin installs is a key part of the WordPress plugin SEO process.
Plugin Rank now tracks two key metrics for your plugins -
This data is available on WordPress.org and visible from the 'Advanced View' for a plugin on the directory, but having to go there to check those starts regularly is a pain, and this data is only viewable in one type of chart.
Now you can get these metrics on your plugin page where you can view by the last 7, 30 or 90 days, as well as having the plugin releases and readme updates annotated on the charts.
I've given the plugin page a good spruce up - making it easier to see the data that matters. I don't think it was previously obvious that the charts were there, and how to see them. So now they a front and center.