Perhaps the lucky ones who allready have a board could share what shields they have tested to be
fully working without too much fiddling.
personally i'm interested in the xbee shields (for example the dfrobot xbee + bluetooth module)
So far the beta testers have been quiet (well we don't know who they are so maybe not), but I wouldn't hold your breath until quite a few boards get out in the wild.
If you can provide links to the shield's schematics we may be able to figure out if they will work or not.
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Rob
Even if some accommodation were made for pin-compatibility of the 3.3V <-> 5V for a given 5V shield, wouldn't there still be an issue with the shield actually requiring a SUPPLY-RAIL of 5V to be powered in the first place? How will the Arduino Due solve this problem -- is there a stepup converter, or else a 5V output LDO somewhere?
Never mind. The Due page lists the following pin:
* 5V. This pin outputs a regulated 5V from the regulator on the board. The board can be supplied with power either from the DC power jack (7 - 12V), the USB connector (5V), or the VIN pin of the board (7-12V).
If a shield has a schematic, then checking whether IOREF is connected to anything would seem to be useful for a first pass.
I've tested the Arduino Ethernet Shield. It works fine (both SD and Ethernet).