As promised, even though mapping was only just added to Aussie Bushwalking I haven't been sitting around doing nothing. One thing you find pretty quickly is that each of the mapping platforms have different strengths and weaknesses. I've used Bing Maps as the base platform for the maps at Aussie Bushwalking for a variety of reasons. One of those is that their licensing allows for me to bring in the excellent OpenStreetMap data... so that's what I've done!
OpenStreetMaps is a collaborative effort, much like ABW itself. As such, the data quality differs from place to place. If you look around the Mt Barney area you'll see that a lot of the specific mountain peaks have already been supplied, as well as many of the walking tracks. Unfortunately looking along Main Range National Park only a couple of the peaks are available.
In the end, this doesn't matter since ABW offers both Bing Maps and OpenStreetMap. Now on any map just pull down the map type option (in the toolbar at the top of the map) and choose OpenStreetMap to get an alternate view. I find it's often a good way of finding exactly where to put the location of a walk.
Now to just find a source of topographic maps...