Starcraft 2 tech trees released!

Zerg Tech Tree

The Zerg are subject to some pretty substantial changes in Starcraft 2, and while not all of them might stick around for the final release there's a lot that has been altered:

Spawning Pool: Now allows the production of a special Queen unit from the Hatchery, as well as the usual Zerglings. Also provides Zergling upgrades.

Spine Crawler: The replacement for the Sunken Colony is not a stationary building, but rather a movable defence structure. Can only attack while mounted in Creep, otherwise defenceless. Attacks ground units.

Spore Crawler: Similar to the Spore Colony, this is also a mobile defence structure that mounts onto the Creep much like the Spine Crawler. Only attacks air units.

Baneling Nest: Allows the production of Banelings from already built Zerglings.

Roach Warren: Allows the production of Roaches from the Hatchery, and provides class-specific upgrades.

Infestation Pit: Allows production of Infestors, and upgrades.

Spire: Allows production of both Mutalisks and Corruptors.

Nydus Network: Any unit can travel through the network to any exit, including allies of the Zerg player.

Zerg Tech Tree (click for fullsize).

Click on for the Protoss tree, or back for Terran.