Okiraku Putter (and Balance Board) Golf
We love the idea of Arc System Works' Okiraku WiiWare game series. Rather than selling yet another sports minigame collection, Arc is selling them a la carte as $5 downloads. With that tiny commitment, even the decision about buying this casual entertainment is a casual one. And if Family Table Tennis is any indication, the games are likely not to be terrible.
"Casual" may not necessarily mean "simple": the next Okiraku game to come out, Okiraku Putter Golf, allows you to use the Balance Board to fine-tune your golfer's stance, in addition to using motion controls for swinging. That sounds insanely complicated!