Google Talk to Books makes literature reviews a piece of cake! https://books.google.com/talktobooks
Author: James Gaskin
Pretty nifty stuff, though only for books. If you combine it with metaBUS for papers, you might actually be able to achieve a pretty comprehensive review for a journal article. For a full review paper, I believe you would still need to systematically review more databases and account for search terms and methodology.
Really nice tools & easy