In Italy you need to show your Int Drivers Licence when hiring a car...they will not accept a foreign licence. Passport must also be shown.
I found this a bit hit and miss. We hired a car in Siena, and they wanted to see the international permit, along with my passport.
Hired another car in Salerno (for a few days in Positano ... that road is one of the great drives of the world!
), - they didn't ask for the permit and were happy with my Australian Licence (but also wanted to see my passport).
Better to be safe than sorry, of course. At the end of the day it's easy to get and inexpensive.
I agree though - it does look like something a primary school kid brought home to put on the fridge.
EDIT: here's a video of a section of that road along the Amalfi Coast from Positano back to Salerno if anyone's interested! An awesome road to drive on as your first experience driving on the wrong side of the road in the wrong side of the car
It goes for about 3 minutes. Apologies if it makes anyone seasick - my wife was trying to hold our little Canon s95 as still as she could
You may be able to tell near the start that we were a bit over Italian drivers by this stage - hence the laughing.
[video=youtube;8G82gY2EZFc]http://www.youtube.com/watch?v=8G82gY2EZFc[/video]