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Windows Media:

http://www.windowsmedia.com/

Windows Movie Maker:

http://www.microsoft.com/windowsxp/using/moviemaker/default.mspx

Apple QuickTime:

http://www.apple.com/quicktime/

RealAudio and RealVideo:

http://www.real.com/

Macromedia's Shockwave Player:

http://www.macromedia.com/software/shockwaveplayer/

Macromedia's Flash Player:

http://www.macromedia.com/software/flashplayer/

Sound Central Free sound files in various formats:

http://www.soundcentral.com/

MIDIworld Music files:

http://www.midiworld.com/

Stock video/film footage:

http://www.cinema-sites.com/Cinema_Sites_PROD4.html

Multimedia Authoring:

http://www.mcli.dist.maricopa.edu/authoring/