Digital Camera RAW Compatibility Update 2.1
Apple just released an update for RAW camera support for Mac OS X Leopard, Aperture 2, and iPhoto '08. With this new update, the following list of RAW-format cameras are supported:
Canon EOS Digital Rebel XSi/Kiss Digital x2/450D
Epson R-D1
Leaf AFi 7
Leaf AFi 6
Leaf AFi 5
Pentax K200D
Pentax K20D
You can download this update by opening up Software Update (Apple menu > Software Update) or by downloading the installer package from the Apple Support downloads site.
Thanks to everyone who sent this tip in!