Personalization in Drupal
I will introduce set of modules: Visitor Actions, Personalize, Acquia Lift which will help you to improve your customers experience on the site, allow you to test different sets of content or structure variations, connect different 3-th party tools for content managment improvements (Acquia Lift e.g.), etc. These modules are new alternative for tons of custom contexts, or panels selection rules, pure rules or anything else you're using for personalization before.
Modules are under the active development and will be posted to drupal.org soon.