I've just had a nice evening, chocolate and cookie cheesecake followed by seeing "Sin City" (IMDB).
It was very good, although its difficult to say I enjoyed it. Definitely earned its 18 certificate. Pretty gruesome stuff at times. But very impressive, if you like the look of the trailers and are prepared for the violence you'll like it. The comic book, noir style is carried off extremely well. With special care taken on everybody's eyes. Bruce Willis' eyes in his first scene carry the whole scene.
I'd say that Sin City owes a great deal to Quentin Tarantino. I don't think this movie would have been possible in this form without Kill Bill and without Reservoir Dogs. Do you remember the controvesy surrounding that undercover cop's ear?
Sin City moves beyond that. I'm shocked that there haven't been crys of "Won't somebody please think of the children", but then times are achanging.
and I nearly forgot... Jessica Alba; fit. Just beautiful, even playing a stripper.
UPDATE(15th June): search engine clickthroughs please jump ahead to here for Jessica lovelyness.