Paypal
I was talking to some friends online and they were talking about how PayPal sucks. I had only really used them for three things and hadn't had any real problems with it. They pointed me at Paypal Warning, a site which documents problems a number of people have had with them. I think what I found disturbing was the thought that paypal is looking at what you are using their services for and selectively policing (and not intelligently either).