This site is a simple but great idea. It is basically a editorialized digest of the Drupal mailing lists. Providing the most relevant information in an easy to view format.
When I was much more active in Drupal development than I am now, I used to subscribe to the Drupal Developers mailing list. It was a great resource but it required a large amount of time to keep up to date with all the happenings.
Earlier this year when I un-subscribed my GMail account had 2600 e-mails from the list. So this site is a great way to keep up with the happenings on the Drupal mailing lists without spending an hour every night reading through e-mails. ;)