In case you blinked, there was a WOZ signed Mac
on Antiques Roadshow (Tucson, AZ, Hour 3). It
was only on for about 20 seconds, but the appraiser
valued it at $6,000-$10,000!
Here's a link to the episode, but no mention of the
Mac. It shows up about halfway through the show.
http://www.pbs.org/wgbh/pages/roadshow/series/highlights/2002/tucson/tucson3
.html