Three inspiring talks:
The short: Graham Hill, on living in small spaces: Less Stuff, More Happiness,
The medium: Barry Schwartz, on why more doesn’t make us happier: The Paradox of Choice,
The long: Kelly McGonigal, on developing willpower so that we can make better choices:
http://www.youtube.com/watch?v=V5BXuZL1HAg (Authors @ Google)