Terry,
I am only really familiar with Nikon NEF support in iView. However, it supports all known NEF file formats. It does this by using the RAW interpreter from NikonView. Therefore, when you buy a new Nikon camera all you need to do is load the version of NikonView that supports the camera and iView will work with its RAW files. Although we can only assume this support will continue, I know it works for the D100, D70S, and D2X. This is by far the best way to support RAW as the camera manufacturer should always have the matching software. iView will also pull the full-size embedded JPEG image from D70S and D2X NEF files. This makes slide shows impressive, full-size, and very fast.
I must agree that if RAW photo management and its associated headache is important to you (and it is to me) then iView is an excellent choice. iView's list of supported cameras is by manufacturer and file type. This could mean other RAW formats are handled using the camera manufacturer's interpreter as well.
Hope this helped!
Sam