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Did you ever wonder how to display your pictures from Aperture 3 Library to your desktop?
Apparently the solution is simple:
1. Repair disk permissions in Disk Utility:
2. In Aperture 3 preferences, under Previews tab, make sure you have "Always" selected in "Share Previews with iLife and iWork":
3. Now you will see the Aperture library in Desktop's list: