I'm sure this is nothing new, but I've only recently been taking advantage of it. This year, when my credit card company informed me that I could get a review of my charges this past year, I took it.
It was quite an eye opener. I was shocked to see how much I put on my credit card this past year. I always pay off the balance each month, so I never really noticed how much I actually charge over the course of the year. In order to earn miles, I charge everything, even groceries.
The biggest shock came in the retail category. I didn't realize I spent so much, most of it with QVC. They have such good stuff that I haven't been able to resist. Hopefully, this year I'll do better this year. So far I've been good even though I've been tempted by the Keurig coffee maker and a clothes steamer.
My goal is to get through this month without buying anything. I'll take it one month at a time. Maybe just one purchase a month.