RGB is more accurately called (most of the time) RGBHV
It consists of 5 75ohm cables.
In comparison, component, as you know, uses 3 75ohm cables.
What is the difference between component and RGB? Mostly it is that RGB can carry higher resolution than component. So, if you want high bandwidth video, component may not be able to handle it as clean as RGB can. Of course, this has become less and less of a reality as technology has changed.
What uses RGBHV? Pretty much every computer monitor in the world has a RGBHV connection. Only, the connection has been converted into a 15-pin SVGA connection instead of a 5 wire connection.
Yes they sell 15 pin SVGA -> RGBHV adapters. There actually looks like there is a good page of info that you will like over at the Blue Jeans Cable site. Not only does Blue Jeans sell these cables but almost every cable manufacturer does.
http://www.bluejeanscable.com/store/rgbhv/index.htm
When would you use a DB15 (15 pin SVGA) to RGB connector? Well, when you want to hook a PC up to a video distribution system. When you have a HD-DSS box like the new Samsung that includes HDTV on DB15 output. When you have a scaler or processor with DB15 output. When you have run a SVGA cable from your PC to your plasma/projector, but the display only has RGBHV inputs and not a 15-pin connector on it.
Since I started working for a commercial A/V company, almost all of my work is based around a RGBHV world instead of a component world as it was with residential.
Is either actually better with HDTV? Not that I have ever heard of, but I haven't looked to hard for head to head tests with both component and RGB.
