Biashara Phone with Credit Card Scanner
This "Biashara" phone with a built-in credit card scanner is being marketed to vendors in Africa, who (in Kenya at least) have stuck primarily to cash because credit card terminals have not been readily available. The phone can process about 300 transactions before it has to be recharged and can print receipts to a wireless printer.
There is presumably some sort of monthly service premium and a per-transaction fee, just like credit card processing everywhere else.
Product Page [SwiftKenya.com via Core77]

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Oh man, I totally invented this when I was in Guatemala. The cell network is better developed and (obviously) easier to connect to than the wired network. It just makes sense to use it for credit card processing.
Is there a product like this that works in the US? Flea market vendors, concert and festival promoters and more would love something like this.
Yeah I bet waiters at Applebeas will *love* this for stealing your money if it ever gets an US debut..