These are some tools I've written with Phlickr:

• FavoriteDesktop downloads a random photo from your favorites list, converts it to a Windows bitmap (using ImageMagick's convert tool) and then sets it as your desktop background image.
• PhlickrUploader is my personal script for uploading a directory full of photos, assigning tags and putting them into photosets.
• GetToken will help you retrieve an authorization token for a given API key/secret.