In the Voice Over world, the Demo is sort of like a resumé. It's a quick way to show the range of your voice, and it is one of the primary tools casting agents use to decide on which voice actor to employ for a project.
Here are my current demos, both Narrative and Commercial. Please listen to them, and feel free to direct other people here if they're in need of a Voice Over.
Commercial Demo (1:19)
Narrative Demo (1:56)