a place for zinesters - writers and readers
Sometimes Ill put my zine next to a good book at the library. Geo-cash's are also a great place. Or inside a copy of the LA times!
Inside geo-caches is a great idea!
My uni has a few little spots scattered around where they leave piles of flyers for events and concerts, I usually stick a few there. They stand out because they're surrounded by glossy, colourful flyers so they're usually always gone by the time I pass by again :)