Android has Airdroid, a must have app for any Android user that wants to transfer their files from phone and computer or the other way, completely wirelessly.
Unfortunately with iOS being a much more locked down mobile OS, such apps don't exist for the platform. However if you're someone who takes a lot of pictures and wants to transfer photos from your Camera Roll to your computer, or the other way round, iTransfer is the perfect app.
When you launch iTransfer, you tap on the little WiFi icon in the bottom bar, you can then access your iPhone camera roll via an IP address in your web browser. From your web browser you can then download pictures from your camera roll, or upload pictures to your camera roll. It's a very quick and easy process.