Picasa is an image organizer and image viewer for organizing and editing digital photos. Get the Picasa NUIA Extension to control or navigate through your library.
Just lean back to start the slideshow or navigate through your pictures via speech commands like "Next Image", "Previous Image", "First Image" or "Last Image". As well you can add new tags with the command "Add New Tags", which opens the NUIA Dictation Menu where you simply say your new tag and add it to the current image with a short "Ok". Additionally the upper left tag button in the NUIA Menu gets replaced with this new value.
Just try it out.