The selfserve ad campaign site got an update and is now offering ads for more than just the trilogy. It currently lists:
Stack Overflow, Server Fault, Super User, Android Enthusiasts, Arqade, Ask Different, Ask Ubuntu, Blender, Code Review, Database Administrators, Drupal Answers, Electrical Engineering, Game Development, GIS, Information Security, Magento, Raspberry Pi, Salesforce, Sharepoint, Software Engineering, Unix and Linux, User Experience, Web Applications, Wordpress
Comparing with the older list in We're enabling display ads on select Stack Exchange sites I notice the absence of Cross Validated. Does this mean Cross Validated will no longer carry display ads? They appear there as of now:
As an aside, "Wordpress" is missing an important part of its name (and an uppercase letter, too): the site name is WordPress Development.