I just signed up for the "Square" app on my iPad.
If you have an iPad, iPod Touch, or iPhone, you can sign up too. It allows you to swipe, yes, swipe, credit cards. No monthly fees, no minimum charges. They are mailing me the swiper that plugs into your headphone jack. A friend of mine showed me how it works today. I signed the screen with my finger and she emailed me a receipt. The fees are very similar to PayPal. We'll see. Is this the new knuckle buster?