More than two million registered Flickr users and counting have discovered the ease and fun to organize their photo libraries, showing off their favorite pictures to the world, and securely share their personal photos with friends, family, or ad hoc groups. In addition to getting under the hood of some of the most popular toys Flickr third parties is in the wild, you'll learn how to: Send photos to your blog directly from your camera Mash up your own photos or other public pictures into custom mosaics, collages, sliding puzzles, slideshows, or ransom notes Backing up your Flickr library to your desktop, and save the comments too Set random desktop backgrounds and build their own Flickr screensaver Geotag your photos and map your contacts Download the list of photos and make a tag cloud sheet contact Make your own Flickr-style tag to visualize the frequency of general building color picker with color wheel dynamic Feeds Flickr photos to your web site and subscribe to Speak your custom Flickr RSS feeds using the Flickr API to use your web browser, Perl, or PHP, and other users to authenticate themselves, and build custom API applications