Apple has updated Aperture 3 to version 3.3, which provides the following features and fixes:

• New unified photo library for both iPhoto (v 9.3 or later) and Aperture; no import/export required; Faces, Places, slideshows, albums and web sharing work across both applications
• Support for AVCHD video has been added
• Aperture now lets you use camera-generated previews for faster browsing of RAW files immediately after import
• Highlights & Shadows tool has been updated to deliver higher-quality results and work with extended range data
• A new Auto Enhance button has been added to the Adjustments panel
• White Balance tool now includes Skin Tone and Natural Gray modes to simplify color balance
• Auto button has been added to the White Balance tool for one-click color balancing
• Set Desktop command has been added to Share menu so you can set a desktop background from within Aperture
• A new Manual option allows you to drag and drop projects to customize sort order in the Projects view
• New preference allows you to set the background brightness of the full screen browser
• Facebook, Flickr, and MobileMe albums are now displayed as thumbnails in the main window when accounts are selected in the source list
• Minor terminology changes, including "Original" instead of "Master" and "Info" instead of "Metadata"
• Source list includes a new "Recent" section, showing Last Import and recently-viewed projects
• Raw Fine Tuning is no longer displayed in the Adjustments panel by default
• Faces can now be named by dragging them from the Unnamed Faces browser to existing snapshots on the corkboard
• The Faces corkboard now includes a menu that allows you to set the order of face snapshots
• Newly designed monochrome source list and toolbar icons
• Addresses numerous issues related to overall performance and stability

[via Apple Support]