I ran across a really interesting site. It is a wiki called Obsolete Skills and lists 12 skills that used to be necessary but are no longer, according to Robert Scoble. I imagine you can add more if you wish.
The ones there now include:
- dialing a rotary phone
- using a slide rule
- refilling a fountain pen
URL: http://www.obsoleteskills.com and http://obsoleteskills.wikispot.org