Since I updated to 1.7.4 a while back, I decided a week ago to start a new survival world for fun.
Since then it has yielded 86 diamonds, 5 emeralds, nearly 1000 iron, about 250 gold and more coal than I can possibly use. Most of that over 3 nights, in as many hours.
Either there's a few errors in the generation numbers, or I happened on a very nice world indeed.
What's the seed? I'd like to try that world out.