This is a cool blog written by a co-worker and friend, regarding skimming, which is the process of scanning and saving information from the magnetic strip of a bank or credit card. Although skimming is rather dangerous, not everybody is aware of it. He also talks about some ways to protect yourself, because, remember: this can happen to you!
http://www.symantec.com/enterprise/security_response/weblog/2007/05/have_you_been_skimmed.html