Australian charities are supposed to use .org.au
http://www.auda.org.au/policies/2012-04/
SCHEDULE F
ELIGIBILITY AND ALLOCATION RULES FOR ORG.AU
The org.au 2LD is for non-commercial organisations.
The following rules are to be read in conjunction with the Eligibility and Allocation Rules for All Open 2LDs, contained in Schedule A of this document.
1. To be eligible in the org.au 2LD, registrants must be non-commercial organisations as follows:
a) an association incorporated in any Australian State or Territory; or
b) a political party registered with the Australian Electoral Commission; or
c) a trade union or other organisation registered under the Fair Work (Registered Organisations) Act 2009; or
d) a sporting or special interest club operating in Australia; or
e) a charity operating in Australia, as defined in the registrant’s constitution or other documents of incorporation; or
f) a non-profit organisation operating in Australia, as defined in the registrant’s constitution or other documents of incorporation.
2. Domain names in the org.au 2LD must be:
a) an exact match, abbreviation or acronym of the registrant’s name; or
b) otherwise closely and substantially connected to the registrant, in accordance with the categories of “close and substantial connection” set out in the Guidelines on the Interpretation of Policy Rules for the Open 2LDs.