Panopoly is a very cool new distributions which has some cutting-edge features. For example, it uses Drupal Apps to download and install functionality on the fly. And it allows in place editting using the brand new redesigned Panels IPE. Furthermore, it has a bunch of responsive layouts (note the use of respond.js) and has a nice editor interface using a clean implementation of WYSIWYG (with media module integration en things like caption filter) and markitup. Other interestingness: page manager existing pages, backports and simplified menu admin. Summing up, panopoly has some great features to improve the content authoring experience, which is currently also a hot topic for Drupal 7 and 8 (Spark).