Touch ID is wonderfully convenient for unlocking your iPhone, and thanks to MacID you'll be able to use your fingerprint to do the same on your Mac. The iPhone app uses Bluetooth LE to talk with your Mac and enter your lockscreen passcode with a touch. You'll need the companion app on your Mac, too, and your laptop, iMac or Mac Pro needs to be new enough to support Bluetooth LE. MacID is awaiting approval for release on the App Store and should be available soon.
Check It Out: Use Touch ID to Unlock Your Mac with MacID