My friend Dark Orange has a keen eye for dragonflies. His latest odonate pictures are up on Flickr.
Australian Tiger (Ictinogomphus australis). This species is widespread in eastern and northern Australia. Two other Australian species have much more limited ranges: one occurs in the Plibara of WA, the other on Cape York in Queensland.
Yellow-striped flutterer (Rhyothemis phyllis). Another northern and eastern species but this one has a disjunct (interrupted) distribution, with a break at the Gulf of Carpentaria.
Scarlet percher (Diplacodes haematodes). This one's found everywhere!