Once again, this issue comes up...
http://en.wikipedia.org/wiki/Digital_Visual_Interface
http://en.wikipedia.org/wiki/Component_video
DVI is digital, Component video is analog. Their signalling is different (they represent the data in very different ways), and as such it is no small feat to convert between them. Yes, that adapter works, but only in certain ATi cards. This is because certain graphics adapters are able to output the signals that are required.
So, I have to ask the questions: What would you like to use it for, and what hardware are you using?