This Friday, the Leonardo DiCaprio-narrated and -produced green documentary The 11th Hour [0] opens in theaters. I'd bet the filmmakers, sisters Nadia Conners and Leila Connors Petersen, were pretty stoked to get a big name to endorse their film and their cause since this seems to be a good way to raise awareness.

Angelina Jolie is, of course, a huge proponent of using her celebrity for good, as is Brad Pitt, most recently with his sustainable New Orleans houses [1]. Pitt also has some impassioned Hollywood colleagues as George Clooney and Don Cheadle continue to help the ongoing crisis in Darfur [1].

But does this sort of thing work to get more people involved? Do you find yourself inspired to do good deeds based on the causes that celebrities get behind?
Source [2]