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故事熟語百選 - temporary - 2011-12-31
I just found a surprisingly nice site with a collection of old idioms related to life, human relations and business. It details their origin, meaning and correct usage.
http://www.iec.co.jp/kojijyukugo/index.php
I really like the design (properly zoomed in, of course); it's not the typical '90s blog like most Japanese websites. (It's not all red if you click through to the actual articles like: http://www.iec.co.jp/kojijyukugo/vo25.htm.)