Here are some sites that seem to contain home-brewed transcriptions of popular Japanese Anime (cartoons) from movies, TV shows, and video games. A wonderful resource for younger students who need to be motivated!

One of the largest of these sites appears to be Ichigo's Sheet Music, which also features an active Forum and Chat community.

Another resource is Josh's Anime Sheet Music Collection - very basic in appearance and layout, but still worth checking out for the volume of arrangements available.