The domain registrar GoDaddy.com took down an entire data center nectartech.com where I do my hosting. They are back online now but it got pretty scary for a few hours. I'm a friend of the owner and being a professional asshole I managed to help him get back online.
What happened was that last week a customer at his data center got hacked into and the hacker started sending PayPal fraud spam. Nectartech shut the server down and fixed the problem however GoDaddy who was the registrar for nectartech.com shut down the domin of the data center. That not only killed their domain cutting them off from their customers since all email went away, but all the domain names that used nectartech name servers went offline as well. Fortunately I run my own name servers and my domains were not affected.
These people at GoDaddy are serious morons and there tech support is somewhat less that 24x7. I have better support than this and I'm a one man operation. This registrar shuts down an entire data center over one machine being hacked. I don't use GoDaddy myself, and I sure as hell wouldn't recommend them to anyone. If you don't want the risk of being arbetrarilly shut down, I'd use someone else
Here are 2 actual phone calls to GoDaddy support.. The first is a phone call at midnight. to try to get them to turn the data center back on. The second call was made the next morning after there 24x7 abuse department came to work.
The bottom line is - do you want your domains in the hands of people like this?