IOS36 -> required by most homebrew and games = not needed, its already enabled with IOS236
IOS37 -> Required for music games and Monster Hunter Tri, WiiSpeak = until now this was mostly chosen in IOS250
IOS38 -> Enhanced DVD-R support, Microphones incl. hub for 2 mics. = until now standard choice for IOS249
IOS53 -> WiiFit Plus
IOS55 -> WiiSpeak, and several newer games that give error #002 without it
IOS56 -> used by Beatles Rock Band and Super Mario Galazy 2 ??? Super mario galaxy works fine with IOS249rev19[38 and 57]
IOS57 -> Enhanced USB Support, possibly ethernet support
IOS60 -> SDHC Support
IOS61 -> SDHC Support
IOS70 -> SDHC Support
IOS80 -> SDHC Support