Jumbledpile has a Flickr set of things he finds "abandoned in books or stuffed on the book cart at the jail where I volunteer." Link (via Growabrain)
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. Come and hear Mark speak at the ALA conference in Chicago on July 1.