I don't want to turn this into confusing graphics discussion. But for anyone interested here's the breakdown...
The current state of graphics in both notebook and desktops is such that all new PCs will have integrated graphics. This is does not mean all PCs currently sold have integrated graphics. I speak only to products recently released or those that will be released.
Integrated graphics come free either as the result of the chipset--the main collection of chips that makes your mainboard function--or the chip itself whether Intel or AMD. The primary exceptions are the high end (extreme/black) processors and high end chipsets that forgo integrated graphics in exchange for higher clock speeds and enthusiast options (such as overclocking).
So whether you want integrated graphics options or not, its likely that any machine you buy will have it. Don't think of this as a bad thing. It means all PCs will have a certain base level of 3D graphics capabilities.
Discrete graphics are manufacturer options. The extra graphics hardware is either used in place of integrated graphics, that is disabled, or inconjunction, where it provides a graphical boost and/or power savings.
Not every manufacturer takes the time to implement power saving schemes using the integrated graphics. However, since the enabling the option is essentially free, you do see many new gaming notebooks that also support battery saving scheme when not gaming.
