Yesterday Apple released an update to it's Digital Camera RAW File Support. The update is just 3.5 MB, but does (for the first time for this branch of Software Updates) require you to restart your Mac as part of the installation process. The update adds support to Aperture 2 and iPhoto '08 for the following cameras:
Canon EOS Digital Rebel XS/Kiss Digital F/1000D
Kodak DCS Pro SLR/n
Nikon D700
Olympus EVOLT E-420
Olympus EVOLT E-520
Olympus SP-570
Samsung GX-10
Samsung GX-20
Sony DSLR-A300
Sony DSC-R1
Enjoy, Alex.