In the age of astronomical education costs, learning for free is a real score. But how many workers take advantage of workplace professional development? Be it an Excel tutorial, a lunch 'n learn or an off-site seminar, these sessions are perks that you should cash into. Not only will you learn something new, you may even be able to beef up your resumé with additional skills and credentials. Taking part in professional development also shows that you're motivated to learn and improve yourself -- a real attribute for someone who's looking to move up the ladder.