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Twitter founder Jack Dorsey's new venture allows anyone with a cell phone or iPod to accept credit card payments.

Twitter was only the beginning. After shaking up the world of online communication, Jack Dorsey is now aiming to disrupt our entire payment ecosystem. Dorsey’s new start-up - Square - will allow anyone with a cell phone or iPod to accept credit card payments quickly and easily.

@Jack talks with @KPCCairtalk about @Square, which is already valued at $40-million. Watch a customer pay for his coffee with a credit card, Square, and an iPhone in the video below (2:00).

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