I ordered discount magazine subscription through ADP/LifeMart at work. Didn't notice the auto-renewal in the fine print at the bottom of page off the screen. They will auto-renew your subscriptions at an exorbitant rate. They are a Visa merchant so the charges will go through even if you change your card number.
Have fun trying to get these cleared off your credit card account. Better yet, don't do business with these scam artists, you'll regret it.