Chad Black wrote a series of articles in his blog about DEVONthink and other Mac applications for history and humanities research.
Devonthink’s classification, search, and AI infrastructure is a step in the right direction. For people who work mostly with the every-growing mass of information available online, the ability to import, auto-classify, and connect disparate pieces of info is very cool, particularly as the internal structure of your database becomes increasingly tight and predictable.
If you are using (or planning to use) DEVONthink for serious research, you may want to read a bit more on how Chad has integrated DEVONthink into his workflow. Read his articles here.