I don't know about everybody else, but I keep on hearing Festivus references in my daily life, (aside from in Seinfeld). I've heard it mentioned in a few radio ads, and I've even seen it on a marquee here in the suburban NYC area.
It's being mentioned several times a day in other usenet groups aside from this one;
[cut and paste this URL] http://groups.google.com/groups?hl=en&lr=&ie=ISO-8859-1&safe=off&scoring=d&q=festivus+-seinfeld
Any one else running into it this holiday season?
We laugh now, but in our future more intelligent society (that features less religion and commercialism), it could become the norm!