How do you render a stereoscopic image? I want to create a 3D animation, but by 3D I mean if you had a 3D tv/screen you could watch it in 3d. From my research in 3d video files they are just regular formats like .avi but they have 2 frames for every one frame of movement. To do this in blender I could put 2 cameras slightly spaced out from each other but how could I get them to both render a image for each frame? Can this be done in regular blender or do I need a plugg-in?
You could use two scenes two render two cameras (see Different camera settings for different render layers?)

However, this is a feature that is currently being developed, so you could try one of the development versions.