Camera Raw 4.4 and higher supports the G9 format, but you need to be running Photoshop Elements 4.0 or higher. You can get the updated plugin from the adobe site.
Adobe - Adobe Photoshop CS3: Digital camera raw file support
I had the same problem with my Rebel XTi CR2 files not recoginized in my older version of Photoshop. I used the free DNG converter to get around that for a while, but eventually upgraded to CS3. For quickly viewing/organizing the RAW files, you might check out the demo download of Photo Mechanic at
www.camerabits.com. Pretty cool and useful app.