The last good book I read was one where they went into Freedom of Info files on UFOs buzzing over gov't bases. Reproduced the actual reports. It just got all new-agey with the Oprahesque abduction crap. Bring on the Space Brothers. The Xists are coming.
There was a guy who mapped out every Saquatch place name in the US and Canada, and figured they migrated every year up and down the western mountains.