Revolutionary explored the use of projection screens for playing Wii. This item from Yujin, on the other hand, uses a projector to allow you to look at pictures of characters who appear in Wii games.
The advantages are obvious: this projector fits on a keychain and comes in packages of eight for only $23. The only setback is that it doesn't do anything but project a single image of a Super Paper Mario, Zelda, Fire Emblem, or Wario Ware character.
Also in today's NCSX shop update: cheap ($25.90) copies of Escape from Bug Island and Alien Syndrome. For use with actual televisions only, of course.