I have Taiko: Drum Master on PS2, but no drum, so I only get to play when I head down to Japantown and use the wonderfully giant arcade cabinet. Apparently, Japan even gets the series on its phones and tablets, hence this tiny drum you can pair to your iPad and iPhone via bluetooth.
I'm not sure how fun it would be on an iPhone, but the iPad is probably big enough that this thing would be a blast. Just look how happy the family is!
There is a Bluetooth taiko drum for iPhone and iPad [TinyCartridge]