Agatha Christie's Evil Under the Sun is now available to solve on the Wii. It was released in the UK in December and can be bought for around £25. The reviews are a bit mixed. I spotted it in Nintendo magazine which gave it 43% and this review at IGN rates it as 4.6/10 and concludes:
There is a good detective story buried somewhere here, but it's hindered by archaic gameplay, and terrible pacing. If you're a huge fan of Agatha Christie's work, or if you're the type of gamer that misses the old days of random item collecting and nonsensical puzzle solving, this might be a game worth checking out, but anyone else is going to want to pass this one by.
Evil Under the Sun is already available for pc as are Murder on the Orient Express and And Then There Were None. And Then There Were None is also available for the Wii.