...but the words in post#2 above implies that a pull-up is not connected, yet the schematic does show a pull-up. If the schematic is correct then words should be changed.
You are right, I didn't follow the links in post#2
John is also right, on page http://arduino.cc/en/Guide/ArduinoMini
it sounds like the pull-up resistor is not on the board.Anyone (John?) to confirm the pull-up resistor actually is on the Mini? I only dealt with plain NG boards so far.
I sent a mail to te developers list, to have someone look at this thread and fix the error.