Osx mountain lion power nap

By far the best feature announced at wwdc 2012 is osx mountain lions power nap.

it will download app and os updates and will make time machine backups while your mac is in sleep mode.

no more waiting for time machine backups to finish before taking your laptop with you, just set time machine to backup at silly oclock in the morning. 3:14 am should be as good a time as any :)