Rolodex Business Card Book 96-Card, $19,
available at Amazon
"While it may be overkill (okay, fine, it’s definitely overkill), this is one of my favorite organizational tools. I’ve signed up for a bunch of credit cards to earn the signup bonuses and take advantage of benefits, and I keep track of all of them by using the Rolodex business card book. I also keep things like loyalty program cards, insurance cards, unused gift cards, and other things in here. It helps me know where everything is and keep them organized, and, since it holds 96 cards, I have plenty of room to spare." - David Slotnick, senior Insider Picks reporter