Today was the first day this season that the cicadas had a red-hot go. I haven’t seen any yet, but what I’m hearing may well be the Redeye Cicada (Psaltoda moerens) that was active around Christmas last year. This species occurs across a large part of SE Australia, from SE Qld to South Australia and Tasmania.
You can find out more about Redeyes and lots of other natural history information on a newly launched website, the Atlas of Living Australia. Its an Australian Government initiative promoting the sharing of biodiversity information. So, read a bit about Redeye Cicadas on Atlas of Living Australia. I found this ALA info by ‘Exploring’ the ‘Region’ I live in (Strathbogie Local Government Area) and then selecting arthropods, which includes insects like Cicadas. The site was launched in October (2010) and is a work in progress – certainly worth a good look.
For more general information visit Redeyes on Wikipedia.
The other common cicada up here is the larger Greengrocer/Masked Bandit, but its usually active a bit later.