For a years I was big fan of demoscene. When I was young, demos and intros (some watched over and over, like "Jizz" by TBL) pushed me to learn many new things; moreover I still like to listen demoscene music; for example tracks from music disc "Ambrozia" released by group Pulse around 10 years ago still sound nice.
Now youtube is full of old and new demos uploaded by Good People. But on the net there are Much Better Good People, who created http://demoscene.tv - you can watch demos in high quality, yeah. BTW I love "Photon" by Purple.