I love cash back rewards credit cards! My wife and I both have cash back rewards cards that we use for business expenses (reimbursed by our companies) as well as a separate cash back rewards card we use for our household expenses. We are able to charge 30% of our total monthly household expenses to the cash back reward card each month.
If you don't currently have a rewards credit card, and you are able to properly manage your credit card debt, I recommend looking into it. My wife was the mastermind behind getting us signed up for the cash back rewards cards and it’s really paid off. We have averaged $59/month in rewards from our various cash back rewards credit cards over the past 10 months. Annually, that would be more than $700, and over 20 years it would exceed $14,000. That’s free money! In addition, charging expenses to a credit card helps with our monthly cash flow.
After having been in a great deal of credit card debt previously and paid untold amounts of interest to the credit card companies, it’s nice to get a little payback. . . literally.
A great resource for comparing various cash back credit cards can be found at creditcards.com. It's important to note that the balance needs to be paid off each month so that you don't incur interest, otherwise cash back rewards don't mean jack.