Why?
http://thesocietypages.org/cyborgology/2013/01/22/the-mendeley-dilemma/
How?
http://geekandgirliestuff.blogspot.com/2013/03/going-all-in-with-zotero-zotpad-and.html
http://www.hastac.org/blogs/craigeley/2013/02/25/ipad-workflow-zotero-zotfile-zotpad
More
https://github.com/chrisjr/zotero-prevent-duplicates
https://github.com/ZotPlus/zotero-better-bibtex