Starbucks' new logo and Steve Olenski's post last week about marketers "who leave well enough alone" with their logos got us thinking. He talks about some studies that show how a brand's most loyal fans respond to logo changes. But what about everyone else? Eighty percent of consumers said, "What are you even talking about?" in an Ad Age/Ipsos Observer poll conducted shortly after the Gap logo morphed into the American Express Blue logo and shortly before it flipped back.