One of the improvements to Moodle 2.7 which will likely fly under the radar for most users is the complete rewrite of Logging for Moodle. The new Logging provides platform for plugins so that developers can leverage logs and data more easily and increase insight to the activities and use of your Moodle site. You can also connected it to an external database, get more details on each event, and filter by different types of events.
Watch the quick 2 minute video guided by Mary Cooch here: https://www.youtube.com/watch?v=enW6Yz41rS4
And if you’re interested in learning more about the specific capabilities visit http://docs.moodle.org/27/en/Logs