Almost exactly like the popular services called YouSendit, RapidShare, etc.

How it works:

For the administrator you can limit the file sizes, file types, amount of times a file can be sent, put a time limit on the file and set the script to auto delete should any rules be broken.

For the visitor:

He/she can send the file to anyone with an email address where the user clicks on a link sent by the system to allow for download. This software is packed with all the options found in the "big sites" an even includes an auto-installer to get you going within 5 minutes from downloading it.