Interesting news: There's a Rush documentary in the works from the guys who did 2005's Metal: A Headbanger's Journey. main quote from the article:
"The doc will include new interviews with some of rock's biggest names -- including members of Metallica, Nirvana and Iron Maiden -- plus never-before-seen footage shot by singer Geddy Lee himself, which Grindstone hopes will attract Canadian broadcasters."
I'll keep an eye out for more info on this.