Anarchy Online: Alien Invasion

Most of Alien Invasion's content centered around player organizations. "City plots" were placed throughout Rubi-Ka which organizations can buy to erect custom cities. These cities give skill bonuses, access to unique equipment, access to new dynamic missions, and venues for role-play events. It also included a new starter area - which serves as a training ground for new characters - and new user interface. The perk system was extended with the introduction of "alien experience points".

Source: Wikipedia, "http://en.wikipedia.org/wiki/Anarchy_Online," available under the CC-BY-SA License.