Google Boost allows you to advertise within Google Places when a user is searching for a business within Google Search. This is a great way to get noticed in a heavily commercialized area, where you could be buried among hundreds of local businesses. Boost Ads are highlighted with Blue pins to distinguish from the normal Red pins that identify non paid Google Places.
Here is some more information on signing up for Google Boost:
Here is a quick view on evaluating your Google Boost Performance: