Crazy how the speed of light (and sound) are eclipsed by technology.
Stian mentioned DOS, Napster, etc. Those (along with WINAMP) were the mainstays of nearly anyone on the computer. And, oh my...the hours spent on trying on every "skin".
Digital music...I think we all felt like "pirates" listening to MP3's that were "shared".
Another classic (well, not as old as WINAMP) was iGoogle which also met its end on November 1st.