The iCarte from Wireless Dynamics is a device which clips to the bottom of your iPhone or iPod to deliver to the iPhoner the ability to read and write to RFID tags and enables syncing via a mini USB port according to engadget

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iCarte for iPhone

and iPod also enables the handset to communicate with various systems, track purchases, and update inventory and can scan RFID tags in the users transport badges, and credit cards, so is quite consumer orientated.

iCarte for iPhone and iPod basically means the user can RFID transactions such as MasterCard PayPass and the like without dipping into their wallet, although just when it will be available and what price the iCarte for iPhone and iPod will command is still a mystery.