I just got ten Diecimila for a class I am teaching, and they all have the warning sticker...
. Removing this seal means that you've read and accepted those terms. Otherwise please return the sealed package to your vendor. look for your board at http://www.arduino.cc/boards
for any errate, updates, and precautions on using the board safely. Thank you for supporting Arduino."
(and then antistat, CE and RoHS symbols).