They convert Serial to Bluetooth, which could have many embedded uses.
They are known as MDFLY, there are also Spanion ones out hter which are faster [source]
The main chip is a CSR BC417 and the other chip is a 29lv800c Flash.
Datasheet: http://mdfly.com/Download/Wireless/BT0417C_datasheet.pdf
AT Command Set: http://mdfly.com/Download/Wireless/BT0417C_ATcommand.pdf
There are a few guys hacking them at the moment
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