My new trick this summer is filling/aerating/chilling the carboy all at once. My aquarium pump/diffusion stone sits at the bottom of the carboy as the ~80*F "chilled" wort is pumped into the carboy through a siphon sprayer. I sink the entire thing in a rope-handled tub filled with approximately 60 lbs of ice (free, banked up from a few days' worth of output from my very productive home ice maker) and frozen water bottles. As the carboy fills, it sinks into the freezing cold water. Once all the wort is in the carboy, I let it sit for about 10 minutes to ensure my aeration system has delivered the most it possibly can to the wort -- all the while the wort is still on ice. I then remove the carboy, dry it, tape on an insulated digital probe thermometer, and drop it in a 50*F chest freezer. While my tap water is around 80*F, this technique lets me pitch as soon as aeration is finished, and the carboy stabilizes at 70*F (which is a decent enough pitch temp for me). Within an hour my chest freezer pulls the temp down to 65*F and it's off to the races...
"Good people drink good beer." -HST