I use zotero to manage my paper library and its wonderful. One of my favorite features is tag search. If I find a paper where they measure, say, the strength of

I use zotero to manage my paper library and its wonderful. One of my favorite features is tag search. If I find a paper where they measure, say, the strength of a particular protein-DNA interaction that I'm interested in, but I know I'm never going to remember the title, I can just tag it with "Pnt binding strength" or something, and then search for it later.