Sorry about the poor picture. Taken through the window as I wanted to get the picture before he left again! This guy's been hanging around for the last couple of weeks. We've been here 3 years and haven't seen him before. The Canberra sight said these were between 460 m and 1600 m, so I thought it worth reporting if it is a Grey Currawong.
Both the colouration and bill shape are certainly suggestive of Grey Currawong, but given the blurring of the image through the flyscreen, I'm not prepared to ID it definitively.
Thanks Jackie. In real life it certainly looks like the pics of them on wikipedia. I will try and get another picture. He/ she has been around a while now. Cheers