CD's
It's 25 years since CD's started being marketed! Yahoo story here.
Makes me feel old...
I didn't get a CD player until 1995, so I was a late adopter (and a vinyl record fan).
CD technology has had quite an impact. I remeber thinking how exciting it was when I installed my first CD burner into a PC - all that data on one disc, plus for music it seemed like a step up from the compilation tape (which I still have boxes of).

Will they survive in a world of MP3's and downloads, plus portable hard-drives for data transfer?