CompareEverywhere
From Android Wiki
[edit] Market Description
CompareEverywhere helps you shop smarter using your phone. Scan barcode to see if that "sale price" really is a good deal. Read reviews to find out what other people think, easily keep track of shopping lists, and more.
[edit] Email
[edit] Source Code
(As of version 1, core decoding source code comes from ZXing (http://code.google.com/p/zxing/source/browse/) / Barcode Scanner)
