How to Spot Deceptive Internet Reviews?

Image from the New York Times

Fake online reviews make relying on online reviews sort of dicey, to say the least. An article at the New York Times points out that positive and negative reviews are often bought (they go for $5 to $10 a pop), and points to work of Cornell researchers analyzing how to tell the difference.

I've looked over both articles -- the one in the New York Times and the one by the Cornell Team, as has my wife and children -- and we were not very impressed! :( I still can't tell what reviews are real!