Also known as Envi, given out for free by E.ON (got it for £12 on ebay, as I'm not on E.ON). The device transmits every 6 seconds a neat xml file with the power usage (and temperature) through a serial interface (an Rj45 socket so it can be run through cat5 quite easily), it comes with a serial-rj45 to USB converter.
Useful websites:
Perl script to submit data to Google Power Meter
Perl script to read serial port (and submit data to Google Power Meter, but the code above is easier to adapt)
Ruby app by IBM
Access the UART
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