Thanks for this, it is worth having these links here for the sake of those who are unaware. It amazes me how many people I come across when bushwalking who are either unaware, or who just don't care. One of the best things about being out bush is the wilderness aspect of it. Having a lot of other people out there detracts from that a bit, but the damage that the ignorant ones do detracts from it even more.
These links are so appropriate, that I'm going to copy them to the
Other Bushwalking Web Resources sticky topic.

I occasionally pack out bits of rubbish that I find left behind by other people, but I must confess I do not always do so (but I never knowingly leave any of my own rubbish behind).
In particular, on my last walk, I came across a garbage bag hanging in a tree which clearly had a very small amount of something in it. I was surprised to think that somebody could leave rubbish like this in one of the most beautiful spots on Earth (just a few metres away from the Northern campsite at the Irenabyss, on the Franklin River).
So I picked it off the tree and took it back to the campsite with me, intending to pack it all the way out and dispose of it properly. However, I soon realised that whatever was in it, had the most horrific stench (even though tied closed with a knot), and I could not bring myself to put it in my pack (and could not hang it from the outside of the pack, due to the scrub-bashing I was going to be doing over the next two days). I left it hanging on another tree at the campsite, for which I apologise to any other walkers that come through after me.
In my defense, I will say that I was literally gagging from the smell, and very nearly emptied the contents of my stomach, the smell was that bad. In hindsight, I could have buried the contents, I suppose and washed out the bag and brought it back, but for all I know the contents may have contained other plastic bags, or such rubbish.