I want to learn to create cinematics in Unity 3d, and if there are any tools and/or projects with source I could use to guide myself.
Are you using Unity Free or Unity Pro. As far as I know Unity Pro supports videos out of the box (using renderTextures), whereas Unity free requires a workaround, if it is at all possible to have rendered cinematics.
Of course you could use predefined, realtime playback of your scene and prevent user interaction (other than maybe pausing, skipping to the end of the cinematic, etc.).