I had the same experience as Neil with Vistaprint.
I ordered some business cards from them and then several months later noticed they were debiting me about £3.50 each month. Rang them and was told I had ordered one of their websites. I did remember looking at them, but had certainly not ordered one. They were adamant I had, but arranged for a full repayment into my paypal account before the phone call had ended.
I wonder how many people are paying for things they have not knowlngly ordered with Vistaprint?