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how many confirmations would this wait for before dispensing? i.e. how long does it take from me paying for the coffee before I get it?

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Only twenty minutes or so, so the coffee might be a bit lukewarm, but it's ok as you'll be living in the future!

Seriously though, this is a really cool fun hack, but I doubt it is meant to be actually useful, or that bitcoins will be ready for vending machines any time soon.

I'm not sure if you're being serious or not, but the cost of double spending is vastly higher than the value of the coffee.

The risk of accepting on 0 confirmations is probably lower than that of accepting fake currency or the cost of processing a credit card.

Just out of curiosity, how hard is it to create fake coins if a vendor is not checking for confirmations at all?

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