Long Tail Thoughts
Where would we look for evidence of the LT? If we accept the proposition that I've put forward - that the LT is a shift towards the mass customization end of the feature spectrum (ie, away from industrial-era mass production) - I think the answer's fairly straightforward: industries which used to be monopolies, duopolies, or oligopolies, and whose structure has changed somewhat due to cheap information slashing transaction costs. In effect, industries which are (slowly) becoming less concentrated. Alternatively, industries in which product offerings used to be tightly segmented and largely homogenous within segments during the 80s and 90s.
There are quite a few nontypical (ie, nonmedia) examples that come readily to mind (with varying degrees of LTness) - autos, cosmetics, medicine (viz plastic surgery niches growing), to name just a few.