I voted for Sin City. The featurettes are top notch, the ability to view each story on its own is fantastic, and the green screen version is very cool. Plus, what other dvd released this year gives you a great movie PLUS shows you how to make breakfast tacos?

PS- Forget to mention the live audience commentary, a very cool feature.

Sin City, followed by The Fly.

Wizard of Oz, easily, for the inclusion of the earlier film versions.