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Photoshop reads the exif data from Nikon NEF files and shows an exif field called ImageNumber, which is actually the shutter count. The exif data can be accessed by opening a RAW file in Photoshop. Once the RAW file is open go to File>File Info>Advanced>
http://ns.adobe.com/exif/1.0/aux. The third aux entry is aux: ImageNumber: the resulting number is the number of images the camera has produced.
The other software tools may make this task easier but I already own CS2.
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This must be a new feature of CS2 because I can't find "Advanced>http://ns.adobe.com/exif/1.0/aux." listed in CS.