Zach,
I have a buddy who is big into Apple. He offered the following in response to your question. Hopefully it helps you out:
Try apple.com, but if it’s there it’s probably either full/free or full/pay
Nikon has free Nikon View file viewer, and i think there is a current version that imports Raw. You may need a Nikon camera serial number to get into the downloads area.
I think adobe has a raw import, possibily built into the latest photoshop (CS or maybe v7.0). Check adobe.com
I think any mac Raw readers only work in system X