[aashay]

To piggyback a bit on the "no spammy emails" idea, one of the most irritating parts of the experience of buying electronics on Amazon is the slew of "new recommendations for you" type emails I get. They are almost always filled with products that are similar (or in some cases exactly the same) to what I just bought.

Where's the logic in that? If I just made a decision to buy a pair of great headphones, why spam me telling me about other great headphones that I might want too?

[lallouz]

Serious laughs. I once bought a ping-pong table on Amazon and received recommendations for other ping-pong tables from them for months. I think that's what happens when you let robots take over all core competencies of your business. :)

[MiguelHudnandez]

I think it is a great engine for books. "You like books about ping pong? HERE'S A DIFFERENT ONE!"

It's one of those cases where the formula doesn't really work when you expand the scope of a project to handle different cases. Scope creep strikes again.