SuperOneClick roots any Android device with a click
With a single click you can root any Android device out there, the SuperOneClick tool is what used to root the Droid X, but now it’s been updated to included the whole lot. Nexus One, Motorola Droid, and Samsung Captivate have been confirmed to work, the list grows but we’re to expect the whole lot. One thing to keep in mind, there’s no way to go back once you do this, so do so knowing your voiding any warranty from the carrier.
SOURCE: XDA Devs, Android Police