Sword Art Online... if you need anything about it, just ask me! :D
1. Sword Art Online
2. Alfheim Online
3. Gun Gale Online
As far as it goes for Light Novel, I have read all of the Volumes up until now.
I would need to know what you want to know in specific to answer.
As for the Anime getting a Second Season, introducing the 3rd Arc, Gun Gale Online, nothing was said yet.
However, it is almost 100% sure that the Second Season will not be coming out in 2013.