Try this one, too
Extraordinary Popular Delusions and the Madness of Crowds. Don't let the original publication date of 1841 fool you: it's a classic.
Anyone affected by the dot-com bubble should read about Tupliomania, which dates from 1624.
Oh, btw, David... I think "healing by touch and faith" goes back a lot farther than 40 years -- say, at least two milennia, depending on the myth system you're looking at. There must've been another reason for Montagu and Darling to have omitted it.