It's a good time to be a credit card user. In this episode of Motley Fool Answers, hosts Alison Southwick and Robert Brokamp bring in Austin Smith to explain three big trends in credit cards today, and what you can do to get the most out of them.Find out how to get the sweetest sign-up bonus possible, why the side perks aren't all they used to be, what big benefits to watch out for, and more.