After 8 years, Star Wars Galaxies turns off the servers on December 15th. While the game didn't hold my interest beyond the one month that comes with purchase, it did some things very well that I hoped other games would emulate.
It had a truly robust crafting system supported by offline resource farming and a true player driven economy complete with player run stores and competitive pricing.
Alternate advancement mechanics for non-combat classes. Tradesmen earn experience by building things, Entertainers by performing for an audience.
Arcade style space combat complete with travel mechanic and customizable ships.
Those are three things I really hope are in The Old Republic.