Media Lister is great for listing the contents of any media folder (and subfolders) on the web. The generated list is configurable, modular, stylable, and really easy for "users" to navigate.
Media Lister Beta
This program is still under development. A few things need to happen before Media Lister will be released. (Check the "to do" list in the Changelog.)
But, it's mostly working. (See an example!)