I just came across the 2D Sense iPhone barcode reader this morning. I did a search on my wife’s iPhone in the App store for ‘QR Codes’ and it popped right up. (Still no luck with ScanLife!). It has a very clean interface and does a good job at pulling QR Codes off of a computer screen. (I have yet to try it in the wild.)
2D barcodes hold a lot of potential for the aid community and I hope to soon see some apps that help to make our job easier. The 2D Sense Platform is a good start.