I think this:
http://savedfromthewatchtower.blogspot.com/2010/01/next-generation-is-this-generation.html
My favorite being...
The Insight on the Scriptures book Volume 1, page 917 makes this statement:
"A generation commonly refers to all persons who were born about the same time. (Ex 1:6)"
However, now the Watchtower Society states according to the April 15, 2010, Watchtower:
"It usually refers to people of varying ages whose lives overlap during a particular time period; it is not excessively long; and it has an end. (Ex. 1:6)"
Exodus 1:6 (And many other Bible verses) can be twisted to fit whatever current thoughts are behind Watchtower teaching.
History:
Generation (Mathew 24:34)...
-1927 = The Anointed
[Watchtower February 15, 1927 page 62]
-1942 = Anyone alive to see 1914
[Watchtower July 1, 1942 page 204]
-1995 = Wicked People alive today
[Watchtower November 1, 1995 page 19]
-2008 = The Anointed
[Watchtower February 15, 2008 page 24]
-2010 = Overlap Generations of the Anointed since 1914
[Watchtower April 15, 2010 page 10]
The Watchtower Society’s teaching concerning the meaning of 'generation' as recorded in Matthew was first 'correctly' understood to be 'The Anointed' in 1927. But brighter light caused it to become an incorrect teaching of a couple of different things over the course of 81 years, only to return back to the original ‘correct’ 1927 teaching of 'The Anointed'.
However, in a little over two years that now has proved to be not completely accurate and needed more 'tweaking' to overlap generations of the Anointed since 1914.