Anybody know what academics, researchers, journalists, et. al. use to keep track of books and other sources they need to find or use? I can't walk around with a big stack of index cards like I did in college, but I often end up finding references to books, etc., that I want to keep track of, or ideas (other peoples') that I want to look into. I don't much like writing in my books, and obviously wouldn't in library books. But a bunch of notes in various places doesn't work--I just lose things.
