A lot of things ;-)

• the design changed a little bit, the categories are now on the left side
  
• the categories are shown as AJAX view which is categorized
  
• the category tree can be autoexpanded at startup
  
• the categories are now stand alone documents
  
• they can contain text and a startup picture and so on (they have a richtext item)
  
• the comments are now placed in an embedded view on the photo form (in notes client)
  
• klicking on the medium sized photo shows the fullsize photo
  
• in the navigation bar the current image is no longer linked to itself
  
• if you change a categories name, all dependent photos will be changed automatically
  
  -
  
• added an openNTF button to the page (you can uncheck this via setup)
  
• category title is now user definable via setup
  
• added "resize with Java" additionally to "resize with EZ Thumbs"
  
• added the new metadataextractor library 2.3.1 by Drew Noakes which can handle much more camera models when handling Exif information
  
• tuned all the code