Slide scanners cost a lot more than the relatively inexpensive flatbed transparency option. For those who may need only an occasional transparency scanned, a flatbed with transparency adapter is the way to go. But if you scan a lot of transparencies, then the only equipment that offers the best quality scans are dedicated transparency scanners. Today, most people use video digitizers for multimedia purposes, especially in the creation of QuickTime movies. But that shouldn't prevent you from occasionally using them to capture still images for print.
Video cameras utilize the same digital CCD arrays found in flatbed scanners.
Video capture software is very similar to traditional scanning software, while the hardware is usually a board that fits inside your computer. The color accuracy will also be suspect. Nevertheless, video cameras are more than competent - in fact, I've been using them for image capture in my own work since 1987. Although it appears to be a digital camera, the Lumina is actually a scanner, albeit an unusual one. It uses standard Nikon bayonet lenses, which give it incredible flexibility.