Flickr
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Flickr is a photo sharing and management website and web services suite. Many of its users allow their photos to be viewed by anyone, forming a large collaborative database of categorized photos.
The service is widely used by bloggers as a photo repository. Its popularity is fueled by its availability to Apple Macintosh users, who are generally locked out of photo-sharing sites because they require the PC/Windows architecture to work.
Its functionality includes RSS and XML feeds, and an API that allows independent programmers to expand its services.
The site is currently running as a beta test as of November 2004. It was developed by Ludicorp, a Vancouver, Canada company founded in 2002.