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@M_V
Integrated = sealed cartridge bearing unit fits directly into the frame.
Integral/hidden/internal = open or sealed bearings fit into a cup which is pressed into the frame and sits inside the headtube.
There's also semi integrated, hiddenset (not the same as a hidden headset) intelaset and microtech.
It's very difficult to find accurate and understandable representations of each on the internet because a lot of carbon frames that use integrated headsets have a metal insert in the headtube that the bearing sit's in, in a cutaway or drawing of the headtube this can look like a cup but it is not, it's a non removeable part of the frame.
Edit: This page of Park's site has a pretty good list and good illustrations http://www.parktool.com/repair/readhowto.asp?id=68 , Sheldon would be the normal goto reference but in this case I think a lot of the types of headset in question have come about since his death/the last time the site was updated.