UPDATE: Wikileaks can be reached at http://88.80.13.160
Here’s the explanation from everydns.net:
“EveryDNS.net Status
All systems are functioning normally.
EveryDNS.net provided domain name system (DNS) services to the wikileaks.org domain name until 10PM EST, December 2, 2010, when such services were terminated. As with other users of the EveryDNS.net network, this service was provided for free. The termination of services was effected pursuant to, and in accordance with, the EveryDNS.net Acceptable Use Policy.
More specifically, the services were terminated for violation of the provision which states that “Member shall not interfere with another Member’s use and enjoyment of the Service or another entity’s use and enjoyment of similar services.” The interference at issues arises from the fact that wikileaks.org has become the target of multiple distributed denial of service (DDOS) attacks. These attacks have, and future attacks would, threaten the stability of the EveryDNS.net infrastructure, which enables access to almost 500,000 other websites.
Thus, last night, at approximately 10PM EST, December 1, 2010 a 24 hour termination notification email was sent to the email address associated with the wikileaks.org account. In addition to this email, notices were sent to Wikileaks via Twitter and the chat function available through the wikileaks.org website. Any downtime of the wikileaks.org website has resulted from its failure to use another hosted DNS service provider.”