There is apparantly some confusion floating regarding what video cables are included in the Xbox 360 and the Xbox 360 Core system. Let me set things straight:
The Xbox 360 Console includes the Xbox 360 HD-AV Cable:
The Xbox 360 HD-AV Cable outputs component or composite video. In addition to having RCA audio ouputs, there is also a Toslink-style optical output for digital audio.
The Xbox 360 Core system includes the Xbox 360 Composite AV Cable:
That should help some folks out that may be confused.
Edit: I had incorrect information regarding the Core system. I have updated this post. Sorry for the confusion, it’s must be the Jet lag.