A good collection is here
http://www.musikizme.com/michael-jacksons-unreleased-video/

Michael Jackson shot a 3D video extravaganza two weeks before his death
http://elbo.ws/post/1828260/michaels-jacksons-unreleased-video-and-songs-more/

Unreleased Video Michael Jackson-If You Dont Love Me
http://vids.myspace.com/index cfm?fuseaction=vids.individual&VideoID=23330422

A secret library of over a hundred songs recorded by Michael Jackson could be released following his death.
http://www.musicvideolife.com/michael-jackson-unreleased-songs-video_67a5f137a.html

An unreleased song by Michael Jackson in which he plays the piano could rank as his greatest ever work, according to his former record producer.
http://www.telegraph.co.uk/culture/music/michael-jackson/5742020/Michael-Jacksons-unreleased-song-his-greatest-ever-work.html

Michael Jackson on Wikipedia
http://en.wikipedia.org/wiki/Michael_Jackson