A great way to stay on top of your credit card account, avoid fees and detect fraud is to sign up for alerts from your card company. There are lots of different alerts you can sign up for. Here are some that my credit card offers:

• Balance getting high - they send you an e-mail any time your balance goes above a dollar amount that you choose. ie, you tell them "Send me an e-mail if my balance goes over $2,000."
• Balance update - they e-mail you as often as you want with your balance. ie, "E-mail me once a week with my balance"
• Credit getting low - they e-mail you if your available credit drops below the dollar amount you choose. ie "E-mail me if my available credit is less than $2,000." Your available credit is the difference between your credit limit and the amount you owe, or balance.
• Available credit update - they e-mail as often as you want with your available credit
• Large purchase alert (this is my fave, as a consumer advocate and identity theft prevention guru) - they e-mail you any time there's a charge on your account of more than a dollar amount you choose. ie, "E-mail me any time there's a charge of more than $80." This is an effective way to detect unauthorized charges as soon as they happen. Of course, you'll find out about any unauthorized charges within a month or less because you always check your credit card statement at least monthly.