NameChk – Check Username Availability at Multiple Social Networking Sites
http://namechk.com/

Namechk.com was designed by David Gosse and Andy Edinborough to instantly show you if your desired or branded username was available at the majority of the top social networking websites. By typing your username into the “chk” search box, it will query all the social sites listed on their page and display whether the username is taken or available. This has been added to Social Informatics Subject Tracer™ Information Blog. This has been added to Business Intelligence Resources Subject Tracer™ Information Blog. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.