Mac OS X 10.6 Digital Camera RAW Compatibility Update. Support for the Nikon D7000 and CP7000, among others.

Mac OS X 10.6 (Snow Leopard) provides system-level support for digital camera RAW formats, which can be opened in programs like Aperture and iPhoto.
Apple published the latest software update for Digital Camera RAW, version 3.5, which adds support for the Nikon D7000 and Coolpix P7000 as well as the following cameras:
• Canon PowerShot G12
• Leica D-Lux 5, Leica V-Lux 2
• Panasonic Lumix DMC-GF2, Panasonic Lumix DMC-GH2
Digital Camera RAW v.3.5 can be downloaded here, more information about OS X RAW compatiblity can be found here.

The Nikon D3100 is supported since Mac OS X 10.6.5, along with the following cameras:
• Canon EOS 60D, Canon PowerShot S95
• Hasselblad H4D-40
• Panasonic Lumix DMC-LX5
• Sony DSLR-A290, DSLR-A560, DSLR-A580, SLT-A33, SLT-A55

See also:
22-03-2011: Nikon, Adobe and Apple release software updates for View NX, ACR & DNG converter and Digital Camera RAW