Credit cards are an important part of how I manage my finances efficiently. I don't recommend them for going into debt, but the can make it much easier to track expenses and do things in a paperless manner. One big time saver is the ability to give an assistant their own card on your account. You can setup whatever limits you need (if you don't trust them completely) but it sure is easier than trying to deal with giving them cash to run errands for you. … [Read more...] about Credit Cards as a Productivity Tool