Whoops, that last message was kind of sloppy, sorry. here's a correction.
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The most obvious difference is in the reinforcement of the derailleur-hanger stop-tab. The Taiwanese dropout uses a "sharkfin", whereas the Italian dropout uses a "nautilus shape" that follows almost the entire circumference of the derailleur hanger.
http://www.seashells.vg/
To my way of thinking, the Italian campy dropout seems to have a larger and much more aesthetically-pleasing triangular cutout window than the Taiwanese campy dropout.
- Don Gillies (who just came back from Taiwan) San Diego, CA, USA