Banfield Flea Fighter
This Google Maps mashup left me scratching my head - not because the map is confusing but because of the large magnified flea at the top of the screen - urgh.
The map uses Google Trends data to visualize the prevalence of fleas across the U.S. at the present time. The 'Data Selector' button, at the bottom of the map, shows you flea prevalence data from 2009.
If you download a Banfield FirstShield coupon, your 'shield' gets added to the map based on your location.
Banfield Pet Hospital
Banfield have also recently released a a Facebook page, which includes a hospital locator using the Google Maps for Flash API.
The map detects your location and shows you the nearest Banfield pet hospital. You can also search for pet hospitals by address using the search box at the top of the map.