Bing was announced today by Microsoft chief executive Steve Ballmer at D7, the conference run by the Wall Street Journal's technology site, All Things Digital. Microsoft's staff have been using it for many months under a different name: Kumo.
It will be available to American users next Wednesday, 3 June, and UK users should have access to a beta version.
The new search engine has a number of innovative features, the main one being what Microsoft calls the Explorer pane on the left hand side. When you search for things, the Explorer pane finds results for related searches. This should be a big help for less experienced searches who aren't adept at querying search engines.