I picked this up at the library -- by Martin Lindstrom, "Brandwashed: Tricks Companies Use to Manipulate Our Minds and Persuade Us to Buy." I'm through the first two chapters and wanted to let others know that it's worth reading! I'm a pretty savvy consumer but there are tricks out there that I haven't caught on to...
http://www.amazon.com/Brandwashed-Tricks-Companies-Manipulate-Persuade/dp/0385531737