Tonight on ABC's Nightline, Ben Affleck will report an "essay" on his recent fact-finding mission concerning the humanitarian crisis in the Congo.

"It's fairly clear that in the modern age that there is a currency to celebrity, or celebrity is a currency, really," Mr. Affleck told David Bauder of The Associated Press. "I've discovered that you can spend it in a lot of ways, or you can squander it. You can be taxed, as well. I really started thinking long and hard about how to use that currency as long as I had it."

In 2000, ABC News tapped Leonardo DiCaprio to interview then President Bill Clinton about the environment.

Martin Bashir, the co-anchor of ABC News' Nightline has been diagnosed with a brain tumor growing on his pituitary gland.

Doctors discovered the tumor recently after Mr. Bashir injured his head on the set of Nightline and was taken to the hospital for stitches.  read more »

Larry Silverstein was on Nightline last night. The ABC News program depicted the World Trade Center developer as a striding, fast-talking, somewhat stubborn visionary "right out of central casting" who was "always, always selling." A pop-up video of the segment can be seen here.