Employees don't always know what to do with unlimited vacation

In June, Ben Zotto embarked on a three-week trek up Mount Everest with a couple of close friends, a vacation he’s been dreaming of for years. He did it because he could: Zotto’s new employer, software startup Evernote, doesn’t limit or even track time off. “It’s a trust-based system,” says Zotto, the creator of a popular handwriting app that was acquired by Evernote earlier this year. “It treats people as if they can run their own schedule.”