I got a friend working there at the moment. He went on the teaching tour as well. Did that for 4 weeks or something - hated it with a passion. Then he got an IT job earning 4 million yen a year. Sound big huh, but it works out to be something like $50k Aussie.
He says that life there is very very different, and that there is a lot to experience, but the downside is that when you first to, you dont really know anyone so it can get a bit lonely/boring.