http://telstrawholesale.com/docs/adsl_exis_cap_by_xch.pdf
this document lists the number of adsl ports available at every exchange in australia

http://telstrawholesale.com/docs/adsl_relief_plans.pdf
this document lists exchanges where there are no ports available, and upgrades will be taking place

both documents last updated on dec 20, i am told they are
updated weekly.

if you dont know about them, they may be of some use.


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A Reader :

Unfortunately, it appears that as of version 11.23052002, 
Telstra no longer provide the number of ports at each exchange. They 
continue to provide the number of spare ports at each exchange. They also 
seem to be updating more often... probably every fortnight now.