I learned about this from Pam of Nerd's Eye View. Pam Mandel is a wonderful blogger, and she's one of the co-founders of Passports with Purpose. From their mission statement: "Passports with Purpose is an annual Travel Bloggers’ fundraiser. In 2009, 90 bloggers participated and raised almost $30,000 to build a school in rural Cambodia (complete with a school nurse and a kitchen garden that provides each child a daily meal). In 2010, we have set our sights even higher. With your help, we will raise $50,000 to build a village, brick by brick, in rural India through our partnership with Friends of LAFTI."
This year, they've reached their goal of $50,000, but you can still participate. I am signing up to participate for 2011, and will donate a gift certificate of some sort. But it all goes to my belief that travel can help heal the world.