Error Message: Undefined symbols for architecture i386 using ZBar Libraries

I was able to play around and get it working.

I updated Xcode to 4.0.2. Also, the documentation for ZBar forgot to mention the other frameworks needed to use the SDK (Take a look at the ReaderSample application). The 7 frameworks need to be in the following order:

Foundation.framework
CoreGraphics.framework
UIKit.framework
AVFoundation.framework
CoreMedia.framework
CoreVideo.framework
QuartzCore.framework
libiconv.dylib
libzbar.a

I wasn't aware the order the frameworks are declared in the Build Phases mattered. Anyways, hopefully for anybody trying to integrate a barcode scanner into their app, this answer will be useful.