Creepy Personalization
The New York Times has an interesting article about eCommerce personalization - E-Tailer Customization: Convenient or Creepy?. The big take-away here is that if you want to experiment personalization, you need to be prepared to adjust because the results may be the opposite of what you want. Before you implement sophisticated display logic, you need to build the capacity to manage it. Otherwise your visitors will probably be worse off than if you did nothing.