I think the German way of counting on one's fingers is indeed the Continental way. I don't think I've ever seen a European do differently. And to me, it makes perfect sense.

I'd forgotten about the joint thing, but you're right. I've seen Thai count their knuckles. Very interesting.

Speaking of differing international habits, as an addendum to the linguistic discussion we had earlier today, I've always found it fascinating that the Chinese point to their nose when referring to themselves, whereas most Westerners will point to their heart.