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Bot_thoughts helped me get this one running with the standalone code found here:

http://code.google.com/p/bt-optical-flow-sensor/

It's happily sending useable streams of pixels to the Arduino.

Strangely enough though, the dx and dy values (for the presumed mouse movement) return zero except sometimes on the very first readout.

I've also tried reading the ADNS3080_PIXEL_SUM register ( super documented code! see also page 27 in the ADNS-3080 docs ) with the result that it transmits a constant value (changing after every power on, though). Viz:

void display_pixel_sum()
{
  byte Pixel_Sum;
  while( !Serial.available() ) {
    Pixel_Sum = read_register( ADNS3080_PIXEL_SUM );
    Serial.println( Pixel_Sum, DEC );
    delay( 300 );
  }
}

I'm puzzled...