iGarageSale for iPhone makes Saturday shopping a snap
But the best feature of all is that you can search through the garage sale listings, filtering your pinpointed sales to only those including specific terms like 'furniture', 'crib', or anything else you might be tracking down. Reviews sound very positive, and at $1.99 US, the app is a pretty good deal. Some complain that there is no way to post your own sale via the app, but posting through Craigslist is certainly no more complicated.
source: Appolicious, iGarageSaleApp