The latest Digital Camera Raw Compatibility 3.0 update for OS X update finally adds Canon sRAW, which until now has been pretty difficult to manipulate on Macs (without third party programs).
This update extends RAW image compatibility for Aperture 3 and iPhoto '09 for the following cameras and formats:
Canon PowerShot S90
Leica D-LUX 4
Panasonic Lumix DMC-G1
Panasonic Lumix DMC-GH1
Panasonic Lumix DMC-LX3
Grab it now from Software Update.