This 2005 article from Deloitte is interesting…(but it is so 2005–premeltdown). A great quote:

“Product innovation gives less than three months competitive advantage. Process innovation gives at least 12 months competitive advantage.”                            – Sir John Bond, Chairman HSBC, 2001

http://www.deloitte.com/dtt/cda/doc/content/DTT_DR_GlitteringPrize_May2005.pdf