I have started a new project that attempts to create a consistent set of tutorials across some of the more popular 3D engines available. At the moment I have some basic tutorials for Ogre, Crystal Space and Irrlicht, but I'm hoping to add some commercial engines like Torque soon. It would be useful for anyone looking to compare the 3D engines side by side.
Check it out at http://www.squidoo.com/3D-engine-tutorials
Check it out at http://www.squidoo.com/3D-engine-tutorials