Declan McCullagh has a story about a stealth practice that apparently has been going on for some time, but blew up spectacularly the other day. GoDaddy pulls security site after MySpace complaints. (I'm quoted in the story.)
It seems a registrar has been deleting domain names in response to abuse complaints — mostly spam and child porn — for a long time. But this week their policy took down a legitimate internet security site on the theory it was a hacker haven — and did it with a minute's warning (or maybe an hour's warning, accounts differ).
If GoDaddy is your registrar, you might want to consider how you feel about that.