Yes they geoblock Australia, they intend to come to Australia at some point but from what I read it won't be for at least a few years.
Mediahint gets around the geoblock.
They WILL ask for a credit card, an Australian card will work fine. The first month is free, so if you don't like it just cancel it before they charge you in the second month.
They will also ask for a zipcode. Use 90210, the only one I knew off the top of my head
HULU works! WOOOO!
Also do they do PayPal? A good way around it too.