Apple released the third point release since the software was released in February. I have not had a change to use it yet, but will post comments on any improvements I see. The update is a about 71MB in size, so I suspect there are no major changes.
"This update improves overall stability and fixes issues in a number of areas in Aperture 3. The key areas addressed include:
Applying adjustments such as Retouch or Chromatic Aberration
Creating and using Raw Fine Tuning presets
Viewing, adding and removing detected faces
Switching target printers and paper sizes when printing
Duplicating Smart Albums
Repairing and rebuilding Aperture libraries
Reconnecting referenced files
Working with GPS track files in Places
Searching for keywords in the Query HUD or Keyword Controls
The update is recommended for all users of Aperture 3.
For detailed information on this update, please visit this website: http://support.apple.com/kb/TS2518 "