World
of Warcraft: Cataclysm may not contain as many new levels as
previous expansions, but that certainly doesn't mean it
isn't equally packed full of new content to explore. To help guide
you on your journey, we've put together a complete
progression flowchart for all the new overland zones and dungeons. As an additional resource, we've also added
a complete section of instance maps, level ranges, and locations for
each.

You'll find it all right here in Ten Ton Hammer's Zone and Instance Progression Flowchart for World of Warcraft: Cataclysm!