If you send a blank email to this address - firstname.lastname@example.org you will get an email back with the current processing times for visa applications.
This is the latest for offshore applications -
Applications for Classes BN, BQ and BR (subclasses 134, 136, 137, 138 and
Priority Applications: 24 May to 7 June 2006
Non-Priority Applications: 10 May 2006
Skilled Independent Regional (Provisional) (SIR VISA)
Paper based applications: 30 August 2006
E-lodged (online) applications: 01 January 2007
It is updated every Tuesday so will give you an idea of how long your visa would be.