I, too, am eagerly awaiting an Aperture update so that I can postprocess my RAW images from the D300 (and eventually the D3) in it!!! I am currently using Bridge and CS3 to do my PP but I really prefer the workflow I have with Photo Mechanic and Aperture. I also have waited to upgrade my Mac Pro to Leopard because of the reported issues with Aperture, Time Machine and Leopard.... While all the other machines in the house are purring happily along with Leopard, the Mac Pro still has the Tiger in its tank!
I'm curious what does Photo Mechanic offer that Aperture doesn't??