I've setup a plane with a particle emitter system. When I render the footage and the particles are glowing. Where do I find the settings for that?
As mentioned by CharlesL, that glow is caused when the particles are rendered with Halo selected in Particle settings > Render:
From the wiki:
Particles may be rendered as:
Halos (for Flames, Smoke, Clouds).
Meshes which in turn may be animated (e.g. fish, bees, …). In these cases, each particle “carries” another object.
Strands (for Hair, Fur, Grass); the complete way of a particle will be shown as a strand. These strands can be manipulated in the 3D window (combing, adding, cutting, moving, etc).
To render a surface, you can change the rendered type to Object (to render a copy of an object in place of the particle) or Group (to randomly select the object from a group of objects)
You can change the halo settings by adding a halo material to the emitter object and changing the Material setting to the appropriate value in Particle settings > Render
The other options are