You can watch it live at the aptly named http://www.whitehouse.gov/live. The details are here:
PRESS CONFERENCE TO ANNOUNCE RELEASE OF “GLOBAL CLIMATE CHANGE IMPACTS IN THE UNITED STATES
A comprehensive scientific report on current and pending impacts of global climate change in the
United States, and why it is important to act now, rather than later, to minimize those impacts.WHO:
Dr. John Holdren, Assistant to the President for Science and Technology and Director of the White House Office of Science & Technology Policy
Dr. Jane Lubchenco, Under Secretary of Commerce for Oceans & Atmosphere and NOAA Administrator
Dr. Thomas Karl, Director of the National Climatic Data Center, lead for NOAA’s climate services, and a lead author of the report
Dr. Jerry Melillo, Director of the Ecosystems Center at the Marine Biological Laboratory in Woods Hole,
Mass., and a lead author of the reportWHEN: Tuesday, June 16, 2009, 1:30 p.m. Eastern Daylight Time
Previous in TP Climate Progress

Nothing to add except irritation.
Why doesn’t this site store their events as videos, instead of just streaming video live?
I work for a living, and couldn’t watch the event, and now it appears that these events are not recorded.
Dang. Shoot. Crap!
This is an important study, and the White House has totally flubbed communicating it to the public, I think.