Aperture 3 won't import RAW photos?

I have been trying for several days to import RAW jpeg photos from my Nikon D90 into aperture. When I insert my memory card (Extreme III) aperture only shows the jpeg-fine (or lower) photos as being available for import. When I try to drag and drop the RAW files, aperture either says "0 photos imported successfully" or the import wheel keeps spinning. I've tried different memory cards, connecting the camera directly via USB and reinstalling aperture. Any advice would be appreciated.

Apple Aperture doesn't get updated as often as Adobe Lightroom (now 3.4 RC). You may need to update your copy to keep up with Nikon's latest RAW (however, I did notice that Nikon d90 is hardly a new camera).