Here's the update from TorrentFreak:
"Mp3-youtube.download almost instantly announced that it was working on a fix and today the site is working just fine. The same is true for Dlnowsoft.com, which was also blocked last week, as well as the massively popular Onlinevideoconverter.com, which is among the top 200 most-visited sites on the Internet."
“To fix the problem, we simply used other servers that are not in the range of IP-addresses blocked by YouTube,” said one operator of a stream-ripping site. “I think the YouTube update is stupid because we will always find a solution,” said another.