Japan have done it again, they've invented a singer called Hatsune Miku who exists solely in software. This isn't just autotune, this is auto-star

Here's a Japanese news piece on the strange new creation called Hatsune Miku
(eng Subs if you clck on the little thing in the right bottom corner)
And here's how I heard of her first, this song was the backing track from a Mugen game. The original is Finnish, the new version is synethsised by Hatsune Miku and Vocaloid
And here's the Vocaloid 2 treatment
Don't you just love technology