I didn't realize the iPhone didn't have such a tool. I installed ShopSavvy the day I got my Droid, and I use it constantly.<p>More impressive, however, is Amazon's ability to find products based on a photo.<p>Interestingly, neither ShopSavvy nor Amazon correctly identify the Michael Crichton trade paperback "Prey" (both substitute a different product), but Amazon immediately found it when I used the 'photo search'. It does very well on book covers, even obscure/less popular ones. For instance, I got my Loeb book identified in about 5 minutes. I'm waiting for it to identify a highlighter (label visible), post-it notes, and Blistex (Label visible). Properly identifying non-packaged goods will be amazing.<p>Edit: it's identified each of my products perfectly using the "take a photo" so far. I haven't gone super obscure yet, but I haven't stayed just in the mainline.
It has had a barcode reader / price comparisons based on the barcodes for some time now. <a href="http://redlaser.com/" rel="nofollow">http://redlaser.com/</a> In fact it was the #2 selling iPhone app for quite awhile.