I went to this last year, and it was crazy, Arianna Huffington got a pencil thrown right at her head by a heckler in the crowd. They have people with opposite political stances having what is basically unmoderated discussions about really controversial topics. Anyway tickets just went up for pre-sale, go to http://www.broadwayoffers.com/go.aspx?MD=2001&MC=2009PUNDIT, and the pre-sale code is already in there, just purchase the tickets like you normally would.
A few of the more notable speakers in the series: Bill Maher, Ann Coulter, Al Gore, James Carville, Karl Rove, Al Sharpton, Lisa Ling and John Quinones.
Definitely a cool event if you're into politics.