I recommend Robert H. Frank's book "The Economic Naturalist" for insight into everyday economics (extracts at http://freakonomics.blogs.nytimes.com/2007/06/22/why-do-reti... and http://freakonomics.blogs.nytimes.com/2007/07/13/more-from-t...). As those URLs suggest, it is of the Freakonomics genre, though IMHO better than the original Freaknomics by being broader and more fundamental. Ch 3 ("Why equally talented workers often earn different salaries...") resonates with PG's articles about inequality/productivity, though unfortunately I can't find extracts from that chapter online.