Miss Cellania has a fun list "You know you're Australian if ..." on her blog. Includes such gems as:
3. You think it's normal to have a leader called Kevin.
9. You pronounce Melbourne as "Mel-bin".
7. You believe it makes sense for a country to have a $1 coin that's twice as big as its $2 coin.
I can't believe there's no mention of barbie: Link