Apple has made Digital Camera Raw Compatibility Update 3.2
This update extends RAW image format compatibility to Aperture 3 and iPhoto ’09 for the Canon EOS Rebel T2i / 550D
and a handful of other cameras.
It also addresses RAW processing issues for the Canon EOS 30D
and two other Pentax DSLRs.
For more information on supported RAW formats, see http://support.apple.com/kb/HT3825