My current favorite iphone app is redlaser. You use your camera as a barcode scanner and it does price comparisons locally and online. If you scan a food item's barcode it also gives you the nutritional values and food allergens. You can also use it to scan barcodes of books and see which local library has them.
It's AWESOME!
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"Accept what people offer. Drink their milkshakes. Take their love." - Wally Lamb
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