OS X Mavericks Activity Monitor. Now with Energy Savings
OS X Mavericks Activity Monitor gets a few new features and tabs, one of them being Energy. This monitors the energy impact an app will have on your battery life. Unsurprisingly flash scores a whoppingly high figure when it comes to battery drainage. Think of this as an almost dummies guide to what's killing your battery life.
Also featured in the energy saving features of mavericks is the ability to identify anything that supports "App Nap" For those road warriors wanting to eek out every single last drop of battery life this will be a go to location for those.
It really seems like Apple is catering for the power user but also making it easy for those types of users who come in off the street to get a handle on their mac, in a ways the ultimate form of empowerment.