In reply to Richard Smith:
I had this with CS3 not importing my Nikon RAW files. I needed to upgrade the ACR (Adobe Camera Raw plug-in) and even then it wouldn't import them. In the end I had to get the Adobe raw converter programme and use that as a work-around.
But if you're just wanting jpgs, why not set to shoot in jpg in camera, rather than raw? Or shoot in both, which is what I do.