Netflix ($8/m streaming, $8/m DVD-to-door)
Internet streaming movies and TV, including many back-seasons of popular shows, and absolutely no advertising. It also has one of the most advanced recommendation engines for finding new media. Can ship DVDs to your door with free return shipping if they don't have an item available for streaming (starting at $8 extra a month). Serves me much better than a cable subscription.
I have often benefited from recommendations for Things I Didn't Know I Wanted.
Given that Less Wrong is a community of unusually intelligent, critical, and self-improvement-focused people, I suspect we can generate a pretty helpful thread of product recommendations — perhaps even a monthly thread of product recommendations.
Rules: