Create a drag-and-drop file upload box with just some CSS and a few (6) lines of jQuery. If you aren’t looking for a drag-and-drop field, this is still a great way to style your form uploads!
Part 2 of the File Upload Service tutorial. Create a hosting service for files that is customizable and easy to understand.
Instead of having numerous file upload boxes to begin with, create a JS function so that the user can add as many as he/she likes.
Create a file hosting service with PHP. The downloads will be direct links, but very safe. Part 1, the HTML form.
Load external information into Flash using LoadVars().