Grimm embedded the trailer to the Avatar film (The Last Airbender) last week, and as I liked it I decided to get out the award-winning and highly-rated Avatar : The Legend of Aang DVDs to watch a couple of episodes. I ended up watching sixteen episodes over two days – it’s that good. So very, very good. If you like Studio Ghibli films you will like Avatar (obviously inspired by Spirited Away, Princess Mononoke, and so on). There are three series in total, but only the first series is available on DVD; the final two have only been released in the US, unfortunately, so it will be a while before we can watch them.
In the meantime you can visit the official website, which has games, clips, weekly comics, and so forth. The UK site has some similar content, but some of it is different. There’s an Avatar wiki. There is a browser-based MMO called Avatar : Legends of the Arena that is free-to-play.