I've just got myself a D7000 but I cant seem to read the RAW files on my Photoshop CS2. What do I have to do to pick those up on my Mac? The camera doesnt even appear on my desk top - which it used to when I used my old D40. I'm still very much a novice so any help would be much appreciated. Thanks.
CS2 is a very old version of photoshop and will not support newer camera raw files. I ran into this problem when I got my D3X and was still using CS3.
If you have an Intel based Mac you can get CS5 which will support (probably) the D7000 in their latest raw converter. That will be an expensive upgrade if you have a G3 or G4 processor in your Mac as you would need a new computer as well.
A better and cheaper upgrade would be to get NX2 or the latest photoshop Elements.
edit: It looks like Elements needs an Intel processor as well.
You can also use the free utility that Adobe offers to convert the images to a DNG format. You can then open them up in older versions of Photoshop like CS2. Personally, I'd upgrade to CS5 if your Mac is recent. Not only is it a substantial upgrade from CS2, especially when it comes to raw file handling, but CS2 is the oldest version that can be upgraded to CS5. If you had CS, you'd have to pay the full price of CS5. If you wait until CS6 comes out, you'll find yourself having to pay the full price of the product and not just an upgrade cost.
As Rick noted, you can use the free Adobe Converter and there is a beta for creating camera profiles.
You can also open the NEF with Nikon View NX 2, free from Nikon, and once you have configured it, you can use the menu option "File => Open with ..." to open a Tiff image of the processed NEF in CS2 or other editor of your choice. Note that the beside the WB in camera setting being used, all of the in camera settings will be applied to the NEF image before being transferred to CS2.
If you upgrade to CS5 make sure you also get the latest ACR plug-in.