I dunno--I've yet to see Twin Peaks (I know, I suck). According to Manners Lady (whose name I forget), it's 'American' and 'Continental'. This website has more description of the difference.

The names beg the question, though: What about Mexico and other countries? How do Mexicans/Russians/Egyptians, etc. hold their forks and knives? And then there's the whole other issue of chopsticks. Oh, teh complexity of it all. *angsts*