What’s on Tap – Thursday September 24th, 2009

Here are the big stories on the agenda today:

• It could be one of the biggest medical breakthroughs of the past 50 years.  An HIV vaccine that appears to be working in a third of the cases.  It's generating lots of excitement this morning following a promising clinical trial.  Chief Medical Correspondent, Dr. Sanjay Gupta has more on the drug, how it worked and what happened to the thousands of people who took part in the study.
• President Obama is preparing to do what no U.S. president has done before. He'll be wrapping up the U.N. General Assembly this morning by chairing a Security Council meeting.  And there's only one item on the agenda. A “world without nukes.”  We're live at the U.N. as history unfolds today.
• It’s a public service announcement that gets right to the point… or maybe, the “peak?”  An ad campaign for breast cancer called “Save the Boobs.”  We’ll show you the video that exponentially lowered productivity in the newsroom this morning.