Tasker (Android app)
Lets you automate many activities on an Android phone. You define a context based on various conditions (e.g. connected to a Wifi network, using certain cell towers, phone spatially oriented a certain way) and various actions to perform upon entering and exiting that context. You can set variables and condition upon them, there is flow control for actions, customisable home screen widgets and shortcuts, and many other neat functions.
Some examples of tasks I use / am pondering:
There's a wiki with lots of downloadable setups you can experiment with for neat results.
I've got tasker, but haven't successfully set it up to do anything. I find all of the layers of menus and terminology confusing and wonder why there isn't a configuration file I can edit by hand.
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: