I've reviewed Australia's site compared to comparative sites released in the US, UK and Canada to form some conclusions on how well we've done.
UK - ePetitions
USA - WethePeople
Canada - e-Petitions
Creating a petition involves an equally complex sign-up form, where a user must avow they're a Canadian - so I've not looked into the creation process. I do anticipate that it would not quite be as sleek and refined as the US and UK versions.