I have started work on a PHP/mySQL Project which allows for simple uploading of files through a HTML form, and allows for downloads via a file listing.
Currently the features are :
Quotas per user
File upload via PHP form
File download via HTML page
It is not yet complete, but very simple and easy to setup.
Files are stored on the filesystem rather than in the database.
If this would be of use to anyone, please let me know and I can release it out into the wild.