Any version of a game delivered on the Wii is a bonus just because it's on the Wii but the Wii version of Spider-Man 3 has a few extra! Not only does the game include two bonus villains, but it features web-swinging through your wii-mote! Check out what EBgames has to say below:
Wii version delivers the sensation of swinging through the city via the Wii Remote™ and Wii Nunchuk.™ It's like nothing you've ever experienced before on the Wii. Two bonus Marvel villains: Morbius™ and Shriek.™
Don't forget to check the Spider-Man 3 official site as well.