Parchment vs. Clay Tablet?
Lunar Calendar vs. Solar Calendar?
Already HDDVD vs. BluRay seems so old, but it's just another in a long list.
As far as audio and video formats, you might like this YouTube channel
There have been some strange formats. People were recording sound on steel wire at one point. And I now own Star Wars on capacitive electronic disc because I recognized it from one of his videos when I was at Salvation Army