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I just downloaded zbar on iPhone 4 running IOS 5 and I tried following the directions for adding a new link and I didn't get an option to add a barcode type, so didn't worry about it. However, it doesn't put the barcode number on the end of the url, so nothing works. Maybe I am missing something?
In the doc:
did you try tapping plus '+' after doing edit->add new link->url to select the code/data placeholder?
See step #5 under "Finding Link Templates" Bing search example.