Calimetrics ML technology is based on multilevel technology. The main concept is that instead of having only 'black' and 'reflective' bits on the disc, you have gray-scale bits. If each bits has 8 shades of gray, you get 3 times the capacity (2^3=8). If you have more shades you can squeese more data. The technology is really neat since you just need to add a chip (and maybe incorporate the technology in future DVD/CD chipsets to cut costs). The down-side is that the discs you create (or any ML based disc you get/buy) it not compatible at all with current CD/DVD drives. This means you can't play it in your living-room (using a normal DVD-player) or in your car (in a normal CD-player). Calimetrics has a very low-cost chip you add to drives which enables ML readout, but no company has the chip in their drive :c I do hope this catches on. 2GB on a normal CD-RW media would be VERY neat especially if was sitting inside my living-room DivX recorder!