Although good drum scans will always beat good flatbed scans, there was a very interesting discussion on the Piezography 3000 user group a month or two back on how best to maximize flatbed scans. The consensus seemed to be that by using Kami mounting fluid on a good flatbed (such as the Epson 1680 series) with good software (like Silverfast) and when using large format (4 x 5 or larger) one can approach drum scan quality. You should probably find the user group (on Yahoo groups) and search through the archives.