I love Avatar: The Last Airbender (the TV series. Don't get me started on how awful the movie was...). A beautiful world + great characters and storyline + awesome action + moments of hilarity + beautiful worldbuilding... when I discovered the show, I was both pleased to see that the story arc was complete in three seasons, and sad that I wasn't going to see any more episodes.
But now there's a new Avatar, Korra.
And she is pretty much Avatar Aang's opposite... but still completely loveable. Korra Nation had the first two episodes up for a little while (official site, mind you; I'm not into this pirating thing), but Legend of Korra actually launches this Saturday on Nickelodeon, so you won't have to wait long to watch the show!
...that is, if you have that channel. Jaron and I will probably be borrowing someone else's TV...