Salecator is a Google Map mashup from New Zealand that displays upcoming garage sales.
It is possible to select garage sales from the map sidebar or by clicking on a map marker. If you click on a marker the address, date and time of the sale is displayed. It is also possible to view the Street View for each sale.
All listings displayed on the map are validated by date and expired listings are not shown. You can list a garage sale on the map by logging in with a Facebook account.
Weekend Treasure - thousands of US garage and yard sales on Google Maps. The site maps sales from dozens of online sources, including newspapers and Craigslist.