Today's idea from adoption.com is to Sponsor a Child, it says for only a year, but I challenge you to do it for years to come!!
Here are some great sites:
Compassion International - the site, the Facebook page
World Vision - the site
Save the Children - the site
This site is an eHow.com article on The Best Ways to Sponsor a Child
Those are just a few ways to sponsor, make sure the organization is reputable and trustworthy!!!