I've gone one better and randomly called people. It's nice when you get a followup, but those are few and far between, and so far have been to tell me that sorry, they couldn't offer me a position.
The CoL website is good. I have an interview for a firm in Sydney from it coming up, so hopefully that goes well. To be honest, I'm mainly concentrating on grad positions now, which is being factored into what firms I apply to.
To the OP: definately try the Legal Centre. They tend to be really good at offering students volunteer positions in small amounts, and I've done a similar placement in Nowra. Also continue to check out the CoL website, and the career pages of whatever paper you read (the SMH tends to have a good legal section).