I have been testing Novus Scan on Mac OS 10.8 Mountain Lion for several weeks now and I’m happy to say that it is compatible. If you discover any problems with Novus Scan on Mountain Lion, please let me know and I’ll do my best to resolve them as soon as possible.
Keep an eye out on the Mac App Store because I have recently submitted an update to Novus Scan. This update fixes an issue with the editing of comments on documents that are in the database. It should become available within the next week or so.