Attached, by Amir Levine and Rachel Heller, a book that challenged some of my beliefs about psychology and relationships. In particular, they argue against the usual "two self-sufficient people" ideal, saying that mutual dependency is normal and desirable. Quote: "If you want to take the road to independence and happiness, find the right person to depend on and travel down it with that person."
Just Ride, by Grant Petersen, a funny book about cycling. He argues against the fixation on bike races, and in favor of a more casual style, which matches my attitude exactly. Although I still think synthetics are better than cotton ;)
Cool stuff online: