So Aussie Gardening is a fabulous site with a wealth of links to all sorts of information; blogs, fact sheets, gardening tips, and a great forum that my neighbour swears by.
My favourite is their plant search where they have a sort of program that helps you to choose a plant for a specific area in your garden. For example, I went in and chose "tree", then "in light, medium and hard soil", then "in a woodland garden", and then it generates a list of all the trees suitable to that kind of area. My list included one called the Black Sassafras, which is not only a very cool name, but also evidently quite popular as a timber to make furniture with. It's really lovely, take a look here.
And not only does this site have all this, it also has me.