I have a little question : what is the wiggly line inside the board edge ?
In addition, if someone wants to use several boards+display side to side, maybe we should add a row of headers, with the DIM / SCK / SCI / VCC / GND shared with the already existing 6 pins header going to the arduino, and taking the SERIAL OUT of the 4th 74HC595 and wiring it to the SER pin of the "outgoing" header".
Nota bene : I used resistor networks in a QSOP package, but those don't really come cheap.R220 = 2.35$ : http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=VSSR16-220-JI-NDR330 = 1.89$ : http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=VSSR16-330-JI-NDIt might be interesting to use 0603 resistors instead, to cut the price down.
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