Just now released.
What's New in Aperture 3.3
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
The update is recommended for all users of Aperture 3.