A lot of the reference material that I keep are technical papers on various topics. Most of these are now available in electronic form (pdf) so I've been thinking of chucking the paper files (which are kind of a pain to keep up with) and going to some sort of electronic filing systems.
Does anyone know of any good applications for storing, searching, and retrieving electronic documents? I would like something that functions similarly to a filing cabinet, where I could see a list of topics or categories, and then under each a list of the articles stored. Once nice thing with a electronic system would be the ability to cross reference the same paper under several different topics. This is something I sometimes struggle with when deciding where file a paper document that could fit under different headings.
Thanks for any suggestions or advice.