Nikonians Uploader

The Nikonians Uploader is a free Mac OS X application available for Nikonians on a Silver membership or higher, allowing you to easily upload images to the Nikonians galleries directly from your Mac.
With the uploader, you can upload one or more images easily to the Nikonians galleries.

Just drag & drop the image(s) you want to upload to the open window of the application, select where they should be uploaded and hit the "Upload" button.