Um... what cables are you looking at, Digital Chaos?
Every DC VGA cable I've seen has a 1/8 inch jack on it. How the hell else would you get sound?!?!? If such a cable existed I highly doubt anyone sold it for very long, or if it's still available it should be like $1.
BTW, most of everyone's terminology is wrong. I'm not blaming you folks in particular, but most people are mislead on these terms. These vary from country to country but here is the US standard:
A phono jack is not the same as a "headphone" jack, they have different impedences. Phono is short for phonograph, or record player.
And you can't technically call it a "headphone" jack unless there is a variable resistance/potentiometer going to it to allowing you to adjust the volume level.
It is a LINE OUT, which means a constant volume level.
Most VGA boxes (I use the Pelican one) also have a 1/8 jack line out as well as a RCA red/white line out. This way you can use 3 different cables to connect it to whatever setup you have and what cables you have handy.
I use the line in on my PC, so I use a 1/8 to 1/8 cord. This makes the most sense because instead of buying separate amplified speakers for my DC, I am using the same 4.1 speaker setup of my PC (which is connected to the same monitor as my DC with a select box).
If you were going to a reciever, you could use a 1/8 to RCA, or a RCA to RCA set of cords to a line in on the reciever.
Anyhow, like everyone says, you get a box then you can have S-video and composite video running to your TV as well... or the s-video input of your PC's video card like me...
Sorry, I'm just a sick bastard when it comes to electronic setups...
y'all play nice now, y'hear?