I worked at the Lodge for 6 months (April to September 2010) as a volunteer when I got back to Melbourne from my PDC. I've no idea how I found out about them needing people but as the universe has it, it found me, and it's bee a great thing. Not only have I learned a lot through workshops, interacted with like minded people, helped the residents get into the garden and eat more healthily, but I managed to design and implement my first irrigation design. So great!
Matt from CERES was employed to run workshops every alternate Saturday on all sorts of topics from seed saving to irrigation to companion planting to seasons to water management. I attended most of them, assisting the residents in their learning, and gaining a good deal of knowledge myself.
After the irrigation workshop where we laid pipe in one of the veggie beds, Matt asked if someone could design the rest, which I jumped at the chance of. Then, we waited until spring to put the plan into action. The funding comes from Merri Community Health, to pay for materials and 2 part-time Permies to help out each week. The result is fantastic - it's a Pc garden that gets a LOT of love from lots of people. A good way to see what you can get for your efforts. I'll post up photos of it soon.
So yeah, volunteering rocks, as does a smart irrigation design =:o)