NBC, ABC start with U. S./Russia agreement; CBS reporting live from Jackson funeral site

What do the networks consider to be the most important news of the day.

NBC and ABC opened their national newscasts moments ago with the nuclear arms agreement worked out between the United States and Russia.

CBS, meanwhile, has anchor Katie Couric reporting live from the Staples Center, site of Michael Jackson's funeral, promising stories on Jackson's ex-wife, the disposition of his estate, and of course, the funeral itself.