Saw this linked on the Money Matters board. It creates a map of the sales in your neighborhood based on Craigslist listings. You can also search according to what you're looking to buy (e.g., maternity, baby, furniture).
Click on the red flags for more info on each sale.
I see 3 listings in my 'hood for this weekend. Hopefully there are more in your neck of the woods!
Re: Garage/Yard Sale Treasure Map