Damon with the African 
Children's Choir, who will
perform at the OneXOne gala.
AP Photo

by Beata Loyfman

What have you done so far this summer? I learned how to crash the servers of Vanity Fair and the consequences of an unfortunate green hat. Important stuff. But it turns out that besides mugging for the cameras, some celebs are actually doing good... for other people!

While Angelina Jolie is on a baby-adopting hiatus, the top spot among celebrity do-gooders has been filled by Matt Damon. This summer, while losing the 30 pounds of the chunk he gained for Steven Soderbergh's The Informant, Damon has also become the ambassador of OneXOne, a charity committed to preserving and supporting children's lives around the world. The September 8 gala fundraiser in Toronto will include performances by Wyclef Jean, another celeb using his cred for a good cause--he's launched a food relief program for his native Haiti.   

R&B crooner Usher took a break from his busy pants-dropping schedule to establish Camp New Look, a two-week program that includes workshops on business and entertainment for teenagers from the country's toughest neighborhoods. 

When not staring longingly at Meryl Streep in Mamma Mia!, Pierce Brosnan has been busy contributing $1 million of his considerable James Bond fortune to environmental causes.

At the other end of the spectrum, there's Harrison Ford, who has his chest waxed in this PSA about the dangers of deforestation. Our planet losing its oxygen supply versus the removal of his boob follicles. Yeah, Harrison, it's the same thing.

Check out an interview with Jason Bourne, er, Matt Damon in the September issue of Condé Nast Traveler.