For those cheap bastiches like me out there, you may be heartened to know that the Adaptec 2903 board that shipped out as a Windows-only SCSI adapter with many scanners works just dandy under 10.2. I already had the newest Adaptec drivers for the 2906 loaded, and with them installed, VueScan found my lovely Coolscan III and everything's groovy.
Mac OS X Hints
http://hints.macworld.com/article.php?story=2002091305413144