While checking out the latest edition of Bicycle Quarterly magazine, came across an article by a fellow named Steve Banks. With that, a link to his site that contains a pretty cool collection of vintage mountain bikes. Models from Cunningham, Fisher, Ibis, Breezer, Mountain Goat, and other brands from the very early days of mountain biking - complete with photos and in some cases video, describing the history of the bike.
If you're into vintage mountain bikes, worth a peek. The bikes are also for sale, according to the article and website. Maybe start your Christmas shopping a little early.