I just came back from Menlo Park mall and I was very impressed with the iPhone application that took me around their awesome mall from store to store and even let me shake my iPhone to find the restroom. This is incredible technology that will help change how retail works with deals and social networking inside actual structures. I also wound up saving $10 at the Rainforest Cafe using the app inside the mall. Highly recommend the mall and using this app at the mall. FYI its called FastMall and its a lifesaver. Link to the iPhone application.
Pros: When you use it with this application you can find anything
Cons: None really, it rocks.