Bryan Palmer has an article on ozpolitics that what is deemed constitutional is ultimately in the hands of the Judicial and not legislative fiat. The High Court under the doctrine of separation of powers is the highest authority to interpret the Australian constitution. But our Westminster style of constitutional law makes government complex and unknowable from the citizen's point of view. It is a fair expectation, in my opinion, that a constitutional system can be read explicitly by a citizen to understand the limits of their government. (more)

A common cry is that the judicial, rather than interpreting the constitution, is activist and making judgements that are more legislative than juridical. The judicial is treated as a specialist position and given tenure to hide it away from political or populist influence. Unfortunately the judicial often takes matters into its own interpretive hands and expands the power of those that appoint them. (more)
Bruce Schneier 's ideas have been commented about on SSR in the past in relation to security. However in this article titled; Unchecked presidential power he has a look at separation of powers and the aggrandization of the executive branch in times of war. (more)
Cam Riley: South Sea Republic. Freedom, liberty, equity and an Australian Republic.