i have been using "redlaser" for a while now...and with the new 3gs, the live scan mode works extremely well! the developers have noted that they will fix the photo scanning mode for the 3gs in an update very soon. I tried another barcode scanning app, it didnt recognize anything. It would also force you to take the picture from far away as if you were using a 3g. Redlaser works very well for the live scanning mode. You just fit the upc into the arrows and they will turn green when it is sized right. you can tap the screen to autofocus also...I was able to succesfully scan quite a few different items. also, sometimes you might want to double check that it came up with the correct UPC number..ive had to scan a couple twice..but most of them work great! this is nice for a program that isnt even designed for use with the 3gs...cant wait till new scanning apps come out.