I see all these apps that can be downloaded by scanning a barcode. The question is, how do I actually do this? What app do I use to scan the barcode and install an app?
Barcode Scanner is the best, you can also create QR Codes to share with others on their website.
QRDroid does it for me. It gives you lots of options to share the scanned data, and even does the opposite (generate a QR code out of an URL or text, for example).