Looky, Mom, we're all original: we didn't call this post "Home is where the hearth is" (but only because that title was already taken). And speaking of being trite, hearthstones may seem like a rather mundane matter -- not exactly high-value gaming strategy, eh? -- yet seasoned players manage to accumulate a little hearthing savvy that makes life in Azeroth (and the Outland and Northrend) a little more convenient.
Hearthstones link you to an inn in a location of your choosing, allowing you to transport ("hearth") back there once every 30 minutes. Prior to Patch 3.1, when you could only use your hearthstone once per hour, choosing where to bind and how to most efficiently order your errands and quests called for more than an insignificant amount of thought. The lower cooldown time today makes planning simpler, but there are still a few points worth knowing to help tune up your efficiency and dial down your travel time.