This is pretty amazing. Paige from Playscapes, the playground design and history blog, has acquired publication rights to M. Paul Friedberg's long out-of-print 1975 DIY classic, Handcrafted Playrgounds, and has made it available again as a PDF. It's just six bucks, too. A great idea, and a great deal on a great book.
Handcrafted Playgrounds by M. Paul Friedberg [playgrounddesigns, thanks paige]