While not as god as a dedicated film scanner, the Epson V700 Photo series (V700 or V750) can scan 12 slides at a time. These flatbed scanners use two lights to scan transparent films. The top lamp is inside the top cover (one has to remove the plastic panel from the cover before scanning). I use VueScan instead of SilverFast and the Epson software, and set the scans to perhaps 2,800 dpi, with a single pass infrared dust removal. While the scanner can scan at 6,400 dpi, the best quality should be past 2,400 dpi and below 3,000 dpi (after 3,000 dpi there isn't much gain on image quality). Keep in mind that if you want better scans with these printers, you still can set them for multiple passes (not just one scan).
So far I haven't had the need for more than one pass per image, and I set VueScan to save the image as Adobe DNG, which in turn automatically launches CS5 and then pre-process the image as RAW before opening and finishing with CS5. That initial pre-processing step is very important in relation to the best IQ.