Most shoppinglist apps we tried when we were selecting our app had barcode scanning but we never used it, it is far faster to just type twi chars and select the too thing. Or just go thru the list of most used items.
My problem with most of those apps is that they're too large and offer way more features than we're interested in, often to the point that they break the way we'd like to do things. Can you recommend an app that you use?