NY Post goes to Chuck Klosterman's Astor Place B&N reading and reports on the author's fanbase.These are the Klostermaniacs, the ever-growing Cult of Chuck that includes bookworms, bloggers and even uber-goober Seth Cohen on "The O.C.," who hailed Chuck's geek wisdom on an episode last season. ... "It is sometimes surprising how intense some of the people are about these ...