Apple has updates its professional photography retouch software, Aperture, to version 1.5.

This update is recommended to all users and brings the following enhancements:

Aperture 1.5.2 addresses issues related to overall reliability and performance in a number of areas, including:
• Contact sheet printing
• Smart Albums
• Watermarks
• Lift and stamp
• Image export
• Versions created using an external editor

The update weights 131MB and is available here [1]