A search on Amazon shows that since 2005 every year there has been an increase in the number of titles under "neuromarketing".
It seems to me that there are two types:
1. Those that claim that everything we knew before has now been disproven,
2. Those that suggest there is now a better understanding of what we knew before.
I spend a lot of space in The Branded Mind discussing my views on this.
Here is a list of neuromarketing books that has appeared in the last 5 years (based on search of Amazon).
Click on the heading for this page on the left and follow the sub-navigation.