By Saul Hansell December 24, 2008 9:59 am December 24, 2008 9:59 am This post is the second in a short series looking at the defining moments in the technology world in 2008 and posing some crucial questions for 2009. Defining Moment of 2008: Google’s offer to help Yahoo fend off Microsoft’s hostile takeover bid. Google’s response to Microsoft’s bid for Yahoo may represent one of the most brillian