New features include:
Faces - Faces makes it faster and easier to search thousands of photos for shots of a particular person. Once a face is detected and identified, Faces can recognise it and then scan the entire library - or individual projects - to find others just like it.
Places - Uses GPS location data to explore photos by the places they were taken. Better still, users can find them on an interactive map. Aperture 3 uses reverse geocoding to convert location coordinates into familiar location names, then displays those locations on the Places map. If a photo doesn't include GPS metadata, simply drag the photo to the spot on the map where it was shot.
Brushes - New non-destructive, edge-aware brushes let users selectively apply powerful adjustments to photos. Paint in a wide range of effects to selectively fine-tune photos. Use Quick Brushes to handle the most common touch-up jobs with just a few strokes: smooth imperfections in skin, dodge and burn or sharpen detail.
Adjustment Presets - Dozens of new adjustment presets give photos a wide range of looks. In just one click, instantly see adjustments in a preview screen: move the cursor over different preset options, and a pop-up window previews the image in each effect.
Full-screen Browser - Take advantage of large Apple displays to get a big, uncluttered, full-screen view of any library. Browse through the entire library in the full-screen Browser, quickly moving from project to project without leaving full-screen view. Use the Library Path Navigator to instantly move between projects.
Advanced slideshows - Create spectacular multimedia shows with photos, HD video clips, titles, layered soundtracks, and professionally designed themes. Aperture 3 includes all iPhoto themes and two new themes: Water-colour Panels and Photo Edges.