Blogger Lee Garrett of myproductivemac.com has started a mini series on DEVONthink:
My workflows will all centre around DEVONthink Pro Office as that is the product I use day to day. […] So that tells you what I use DEVONthink Pro Office for and why I recommend it so highly. The next few posts will look in more detail as to how I have it configured, how I import data on both OS X and iOS, how I invoke searches, tagging, backing up databases.
Check out myproductivemac.com while the series unfolds and make sure to also check out all the other useful articles Lee publishes.