Flickr is a popular photography site. Its webservice interface has lead to a number of mashups using its content:

• Tag Galaxy produces a galaxy of the nearest tags to the tag entered.
• Retrievr search flickr by sketching.
• Clockr displays a clock of flickr digits.
• Fastr a fickr guessing game.
• DailymashupFlickr mashup into a daily news
• Montager creates a mosaic.