This is a How-To to install your linux distro live CD without needing to burn it and put it in your drive. This will for sure save you some CDs.
Would it not be easier to do a network install or usb install? Most distributions support those methods these days..
It maybe a little bit easier, but not everyone has a Lan or an USB (At least i dont have either of them), so i think its a handy solution for everyone who runs out of CD/DVD and has a new distro to try.