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share images, docs and videos and create community discussion (audio and text and video) around it. Seems to have potential for instruction. Free version has limits tho.

Free file-sharing and media-sharing service that enables users to take anything ranging from music, videos, documents, audio, and add them to a private, online space called a 'drop' to share with colleagues and clients through email, web, phone, fax, and more.

Helps you find new music based on your old and current favorites.