"This is a [sleek,] simple php script which allows you to upload and download files. There isn't any complex user management because it aims more for private file repository use. It as direct file deletion using AJAX, instant table sort using a self modified version of sorttable.js and finally upload file progressbar using a cgi(perl) script."

Olate Download is nice, sleek (and open-source) software with which you can create your own download repository community. Is very cool and looks quite customisable - although it already includes many user-adjustable settings - well worth checking out if this is what you need.