I use OziExplorer on a netbook mounted on my dashboard. I am running Hema, Auslig, Rooftop Festy and just about every other map around however I can't find anything decent for Queensland and have recently added Camps 5 to the waypoint log.
I also found a supplementary program that kinda piggybacks onto Ozi called OziPhotos. It sorts photo's taken using your digital camera, syncs with the GPS timestamp and enters the pic on your map/track. Great for those of us that always get home and eventually d/loads the photo's but forget exactly where they were taken.