I use Qippa (http://www.qiqqa.com/ http://www.qiqqa.com/) simply because it's fast. It's probably similar to Mendeley - i can tag, organize, mind-map, highlight

I use Qippa (http://www.qiqqa.com/ http://www.qiqqa.com/) simply because it's fast. It's probably similar to Mendeley - i can tag, organize, mind-map, highlight, share, etc.