This is my website, its sorta still in development but it is complete.
So far it only supports image uploading.
When a user uploads a file it compares its extension to a list of allowed extensions, then after it does that it checks its mime type, if it is allowed it will be uploaded.
I have something that displays the image, which it checks the extension and the mime type before it is outputted. I would do .htaccess but I don't know anything about it. Try to learn RewriteRules
The website is http://www.ng2b.com or http://www.transferget.com whichever you like best it doesn't matter.
Please post any vulnerabilities in the script and I'll be sure to patch them up asap.
This script does not currently use any kind of databases.
I'm not the best graphics designer either so sorry D: