Batch apply settings Aperture!
One thing that I really wish Apple had implemented in Aperture is the possibility of applying adjustment settings in batch (to multiple photos at once). It is possible to do something similar by copying adjustments and pasting them on multiple photos. To do so, you just have to right-click on the photo that has the right adjustments and choose "Lift Adjustments". A semi-transparent window will appear with a list of all the adjustments that you copied. You can then select multiple photos that you want to apply the adjustments to and click on "Stamp Selected Images" in the semi-transparent window. The adjustments will then be applied to all the photos selected. It is also possible to remove some of the adjustments in the list before stamping them on other photos by simply selecting the adjustment and click on "Delete".