BTopenworld has suffered a security leak of biblical proportions after the details of tens, nay, hundreds of thousands of customers were published willy-nilly on its Web site. Our source at the Times said he downloaded 3MBs of personal data onto his desktop before BT finally plugged the security hole and ripped down the sign-up page. The files contained names, addresses, e-mail addresses, etc from consumers and business people interested in BT's ADSL products. Not particularly inspiring, is it. Predictably, no one at BT was available for comment. So they couldn't say when the registration service would be back up again. Today's slip mimics an episode last month when BT published -- by mistake -- the names, telephone numbers and email addresses of more than 800 phone users on its official Numberchange Web site. When it comes to Web security, looks like BT needs some help. Interesting to see how it wriggles out of this one. ® Related Stories BT boob exposes personal details