Actually, there are even more than two types. The iLiad uses Wacom inductive technology, which requires power (and a special stylus). The eBookwise 1150 uses a resistive touch screen, which uses little power, and will work with a stylus or fingernail, but reduces transparency of the screen to 85%, making it a bad choice for reflective e ink screens. The iPhone uses a capacitive touchscreen, which works well with skin contact, but poorly (if at all) with any kind of stylus, though there may be a stylus that does work with a capacitive screen. There are also stress detection screens, which may be what the Sony 700 is using, as well as audio detection, refraction detection, and several other options. See the Wikipedia article on "touch screens" and "graphics tablets" for more info.
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