User friendly Web FTP with preview

We want a media exchange website, and would require web enabled upload and download similar to web FTP but has to be user friendly. That can faciliate preview images, videos, audio in either FLASH, QUICKTIME, REAL AUDIO, MEDIA PLAYERs and such. Basically a simplified version of [login to view URL] where people can submit and download (preview) audio and videos with just one link. Minimum login and password required but still require security (maybe some sort of time limited link where people can email to). We understand this require database and web interface, and would be gladly accept suggestions on scripts installation that can faciliate this, customised script, or just bespoke solutions. Basically please give us some proposals to think over with. Any questions, please message us on Private Board. Thank you.