BitCoin "Debit" Card?

[MisterMelancholy]

Pros and cons?

From what little I know about economics, these are my thoughts:

Pros:
Allows for spending of BTC in real world from anywhere

Cons:
The scarcity of people who'd accept them
Scam artists making look-alike machines that just save passwords (then again, this is possible for all Debit and Credit cards)

I don't think the hardware would be hard to create:
Create a plastic card thing with a magnetic strip that holds the BitCoin address.
Keyboard with card reader.
When user swipes card, they provide their wallet password.
The keyboard logs into said wallet, and transfers the agreed upon amount of BItcoins.
The keyboard logs out of said wallet and doesn't save the password.