I have joined wikibooks to create a free textbook for the VCE Physics curriculum unsurprisingly called VCE Physics.
Potentially this might expand to encouraging books on other VCE topics... there seem to be some already started i.e. VCE Chemistry (doesn't seem to have got far yet) and VCE Specialist Maths (has some more content but just seems to be listing stuff rather than actually providing textbook-like content). Potentially I might be able to help out / kick start more of an effort in these, or other topics too.
Alternatively I might go in some further directions with the physics stuff... dunno. I'll see how things pan out on line and IRL.