Just got accepted into the Australia Beta, its working awesome.
Stripe AU supports AMEX and USD charges, right?
USD charging is definitely essential for SaaS selling to the US.
Stripe in Australia makes me very happy though, and I may have gone down that route for the brand alone if I hadn't already integrated Braintree into my app (with a nice library, to boot).
Looks like we'll be integrating in Stripe into our eCommerce system for our clients once we get into the BETA. :)