One way I’m “going green” is I am no longer taking a paper receipt at the gas pump. Where does the iPhone come in, you might ask?

Well, it works like this… I pump my gas and decline the paper receipt and simply take a picture of the amount I paid for gas. I then e-mail the photo to myself at home so it can be reconciled upon my return home. Yes, this assumes that I pay at the pump, which I do 99.9% of the time.

See sample photo.
iPhone Gas Pump