So I was happy to find a pair of Black Falcons nesting in a tall eucalypt on private property near Lake Clarendon in the Lockyer Valley, about an hour's drive west of Brisbane.
I first noted a single bird soaring above the trees when it was joined by a second. Both falcons then landed on the nest.
POSTSCRIPT: It appears this breeding event was successful. Two fully fledged juveniles were seen at this site, along with their parents, on November 9 by Tom Tarrant, Gopi Singaravel, Raja Stephenson and Nikolas Haass: http://www.eremaea.com/BirdlineRecentSightings.aspx?Birdline=7.
In a patch of woodland in the area I couldn't resist playing around with a couple of thornbills.