Under new laws (they don't come in until the 31st of January, 2011) according to the Fair Trading website, “If a tenant is no longer under a fixed term agreement and the landlord
wants the tenant to move out ‘without grounds’, the notice period
increases from 60 to 90 days. If notice is given by a landlord just
before the end of the lease, the notice period increases from 14 to 30
days.”
At the time of writing, that law doesn't yet apply and they only have to give you 60 days notice. If this is a problem for you, contact TenantsNSW and they will advise you on what your options are.