The first guest during Guy Kawasaki’s feature presentation at
Macworld was Jack Dorsey, who has recently changed his focus
from Twitter to his new startup, Square. Square’s goal is to
allow anyone to easily accept credit card payments on their
iPhone or iPod touch using a […]    Square’s goal is to allow
anyone to easily accept credit card payments on their iPhone or
iPod touch using a tiny dongle that fits into the device’s audio
input. Imagine how easy it will be to buy or sell items through
Craigslist using a credit card. What if your friend owes you
money but he doesn’t have any cash? Plug in the dongle, which
Dorsey claims will be initially free (although I can’t imagine
that strategy lasting forever), launch the Square app, swipe
your friend’s credit card, and you’re done.  Dorsey and Square
are trying to improve the experience around credit card
transactions. Instead of paper receipts, Square users can
receive receipts via email. The image below is an example of one
from when I visited Sightclass Coffe