With the emergence and popularity of Knoppix, a universal “run-from-CD” Linux distribution, it is too easy to forget about all other Linux-on-CD projects. And there are plenty of them. Some are designed to demonstrate the power of Linux to unsuspecting users of other operating systems, while others are highly specialised projects useful even to experienced Linux gurus. They range from emergency rescue and system diagnostics CDs to multimedia oriented projects that transform a diskless or OS-less computer into a full home theatre. Each of these projects has a unique feature, a merit and a niche to fill. Let’s take a brief look at each of them.