Australia

Optus
As with all Australian PAYG sim cards, you will first need to show some ID (dirvers licence, passport) and fill in a form with your address. This is a new law brought in about 2 years ago, as part of an anti-terrorist bill.

Default data rate
iPhone - $40 for a month, includes lots of calls, sms, and 150mb for 1 month iPad - $20 for 2 gig

Fair use policy
Unknown.

Availability
Uknown

Tethering
Unknown.