I bet Visa would reject as a winning suggestion that their card is a great way to build credit so you could apply for an American Express, if they ran a similar poll.
I was gonna say this but Casascius beat me to it.
Mintchips ARE the digital currency they were trying to promote. And the winning votes basically said "Mintchips are a great way to buy something even better, which is not Mintchip".
Or they were thinking of adopting Bitcoins in the first place and set the site up to do a mystery poll on the public to get clues on how to market it right.
And I bet you a thousand non-existing BTC that's exactly what they were doing as I'm sure all those big players in the business have been brooding about this as early as everybody else on here.
Btw, this thread always makes me lust for mint chocolate chips...