Guitar Hero World Tour on Wii promotes cleanliness of ones fridge.

If youre planning on buying Guitar Hero World Tour on Wii and want to purchase some of the games downloadable content youll need to keep 200 blocks free in your Wii system just to play the songs. While the SD card can be used to store your many downloads, a portion of the Wiis internal memory is still required as a scratch pad of sorts. Instead of the game reading the song directly from the SD card it will copy it to the empty blocks, play the song and then delete it once its done. Interesting method, could 200 blocks be a deal breaker for you?
Source: GoNintendo