So now we go to the real world, a world of limited finance, a world where we reuse as much of our existing equipment as possible, a world in which we build if we do not have, and purchase if we can not build. The Nikon N90 is an extremely nice camera. It has all the amenities of a professional 35mm - excellent optics, metering, accessorizablility, motor drive, infrared remote to name a few. While all of these things are nice to have, they are not required to create QuickTime VR content. All cameras will allow you to create.
Some cameras are nicer than others, but they all work.
If you can capture an image, you can create panoramas with it. The camera itself should have a tripod mount socket for secure mounting, and be capable of taking more than 16 or so images before needing to have film or memory replenished. Depending on the lens used, the number of images per panorama falls generally in the 12 to 24 image range - 12 images for a 15mm lens and 24 images for a 35mm lens on average. For outdoor panorama creation, you would like a camera capable of using a 24mm to 35mm lens. A 24mm lens for outdoor work where the important information is fairly close to the camera, such as when shooting an area with a lot of columns.