I have been searching for an extension like this for over a year, not really knowing what I needed! A friend told me about DOCman, he uses it on all his sites. Once I bought it and downloaded it, it went straight into my site-easy as pie. I had a little trouble with set up initially (due to my own inexperience, mostly) but the support from the DOCman website was fantastic. I found answers to some of my questions in the forum and asked one of my own. It was answered the very next day! One thing I find lacking in an open source environment is support for noobs like me (everyone already seems to know what they are doing already I guess). I VERY much appreciate the support and documentation of DOCman.