Aion or other free-to-play mmorpg's

Aion became free-to-play (na.aiononline.com/) over the past year. I just started playing it and it seems pretty nice. Just wondering if anyone here plays it?

It seems like a lot of mmorpg’s are using the free-to-play model recently. Does anyone else play any of the other free mmorpg’s? If so, which ones?

Guild Wars 2. Technically, you still have to purchase the game, but you don’t have to pay each month. Recently was considered by many the best MMORPG of 2012, and it’s worth it.