Apple released an update, Digital Camera Raw Compatibility Update 2.4, for digital camera RAW file compatibility. Digital camera RAW files are supported by Mac OS X 10.5 Leopard or later.  The update extends RAW file compatibility for Aperture 2, iPhoto 08, and Finder.

This update extends RAW file compatibility for Aperture 2 and iPhoto 08 for the following cameras:

• Canon EOS 5D Mark II
• Canon PowerShot G10
• Pentax K2000/K-m
• Leaf AFi-II 6
• Leaf AFi-II 7
• Leaf Aptus-II 6
• Leaf Aptus-II 7
• Leica M8.2

It also addresses issues related to specific cameras and overall stability.

Official Website