Carl Bialik from WSJ writes "Microsoft, Google, Vodafone, Nokia and several other companies are backing .mobi, a new top-level domain aimed at making it easier to browse the Web on mobile devices, such as cellphones and PDAs, the Wall Street Journal reports. On Monday, Mobile Top Level Domain opened registration. 'In a matter of hours, thousands of websites were signed up, including Yahoo.mobi and Hotjobs.mobi. For now, registration for dot-mobi Web sites is open only to members of wireless industry trade associations, which include wireless carriers, handset manufacturers and media companies, including Yahoo Inc., that want to make money from providing content to the wireless Web.' Registrants have to follow certain rules to get the domain, including that sites cannot 'cause pop-ups or other windows to appear.'"