I have been using this and love it. One of the things I use it for is to remind myself in the future to do a specific thing at a specific time (I have Gmail on my iPhone, so it pings me when I get the email), but in a way that's phrased as a request from a past self (e.g. "Hi future me, Do this thing! It'll be awesome! Cheers, past me") so it'll feel like I'm breaking a social commitment instead of just ignoring a reminder.
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: