Adobe has posted for download the official release version of the Camera Raw 3.6 plug-in for Photoshop CS2. The only change since v3.5 is processing support for 13 additional cameras' RAW files, including the Canon EOS Digital Rebel XTi/400D and Nikon D80.
Follow a link below to download:
Installation instructions and the full list of supported cameras is in the Camera Raw 3.6 Read Me.
Camera Raw 3.6 was first made publicly available in beta form last month.