I am selling this flash image gallery creator that I developed. It supports multi-user environment.
Basically, you install the files (swf, php scripts) and install database in your website.
Your web site visitors come to your website and they will use the flash image gallery creator to make one or even more flash image galleries for their own use. They will copy a piece of code and paste it into their website.
Users can upload image into your server and these images will be shown in their flash image gallery.
If images are already hosted somewhere, the user will only need to add the URL of the image.
Users can come back anytime to make changes to their flash gallery.
If you like to buy this script, please let me know how much you want to buy it.
This working script is in my website. You can play with it so that you know how it works. [url removed, login to view]
Thank You Very Much.