Over the years I have downloaded and kept thousands of pdfs of articles. I am wondering what is the best way of organizing these soft-reprints for the most efficient data retrieval? Neatly arranging them to folders never worked for me, as same article could be part of many different folders. Naming pdf files with title/keyword and author name had been working for me for quite some time, yet quite cumbersome. Linking each pdf file within endnote is again such a big task. I am looking for a tool to quickly search through pdfs (including its contents "full texts") and ability to tag a pdf with custom key words. Any insights?