I saw this opening day, and here is my proview from the movie board:

Sin City
(2005/Frank Miller, Robert Rodriguez, Quentin Tarantino)
****
[First Viewing]

Sin City is a place built on corruption. Three stories are told. One of an over the hill cop trying to rescue a kidnapped girl. One of a deformed man who wakes up to find himself framed for the muder of the hooker he slept with the night before. And one of a drifter who gets more than he bargained for when his latest fling has an abusive boyfriend.

As the reviews have stated, this is film-noir on steroids. It's nice to see the rebirth of genre, a film that has all the great qualities of those hard boiled detective yarns that Humphrey Bogart became the face to. Only it goes a step further. The sytle is dark and beautiful; black and white mixed with random bits of colors and haunting silhouettes and shadows.
I've never been one for comic book adaptations, but this works because it doesn't try to imitate the original, it becomes the original. So well done. The founders of film noir should be proud.