I recently was told that Cave Story was ported to the Wii. It was an excellent game on the PC, the perfect match of excellent gameplay and story. The Wii version isn't just a straight port, is it? Are there extra features available that will provide a completely new experience to the game?
Other than everything being hi-def-ier (Video and music wise), the wikipedia article seems to list a few extra game modes (and naturally you can check out the references for that info).