Comment Option
You can leave comments in 2 ways: in a popup [ interner Flash-Link ] or as in a content page.
Note: For the time being the comments (popup and single page) are in german only.
I will update it as soon as I have some time...
Like in a blog system you can have different comments based on different areas of your website.
By using the comment in a popup you could even have an individual comment per picture...