Cool new book project about rainwater harvesting techniques, proceeds support Appropedia (which is a community wiki that documents various design patters for sustainable living):
https://www.kickstarter.com/projects/lonnyg/to-catch-the-rain
No personal affiliation, but I did an extensive interview with the author last year, because Appropedia is really neat:
https://passionatevoices.org/2016/02/19/episode-4-lonny-grafman/