I am helping someone migrate from a wordpress.com blog to a WP(.org) setup. I am familiar with the main differences between using wordpress.com and WP software (e.g. as explained at http://en.support.wordpress.com/com-vs-org/).
However, I am trying to understand which widgets and 'plugin' type functionality are part of wordpress.com but not part of WP software, and if there are plugins to replicate that functionality.
I'm aware of some (e.g. WP-stats), but was wondering if there is a definitive list somewhere?