Hi,
I noticed an instruction which seems to need to be updated in this tutorial:
http://www.arduino.cc/en/Guide/MacOSX
Open the LED blink example sketch: File > Sketchbook > Examples > led_blink.
Which for 0009 seems to now be:
File > Sketchbook > Examples > Digital > Blink
As far as I can tell I can't edit the page in question myself.
--Phil.