I have an iPhone app that reads barcodes. I want to transfer that data to a program I have written on my PC. Is this possible?
The easiest way to do this is to have a web server which the app transfers the barcode to and the application on the computer grabs it from. You could probably have each user make an account which they log in to on both the phone and the computer.
EDIT: This document: http://developer.apple.com/library/ios/#technotes/tn2152/_index.html describes various methods for transferring data between an iphone and a computer.