I recently went and checked out the ninjai site again, and to my surprise I found new episodes had been posted. I was pretty excited, and made sure to watch all of them from the beginning.
I first found ninjai over a year ago. It's an animated series about a young and very skilled warrior. He's not sure who or what he is, and over the seven completed episodes he journeys through the land looking for clues.
What I find most interesting about the series is the evolution in technique. The first episode is obviously inferior to the most recent episodes, but they're all fun to watch. Personally, I'm extremely looking forward to the next episode.
One thing to note is that ninjai has gained in popularity, and therefore has repeatedly run into bandwidth cost issues. Although all of the episodes are currently available with minimal advertising, if history repeats itself the ninjai gang may pull the episodes at some point in the future until they find another way to host them at an affordable price. I hope this doesn't happen, but you should check them out now while you can. What are you waiting for? Get to it!