I need your charity ideas!

So, I decided a while back to try to make a monthly donation to charity. I can afford it, and it is nice to feel like I'm making the world a better place. I didn't make August's donation until today ;) what with moving expenses and all, but now I'm looking for ideas for September. Ideally I won't make repeat donations to an organization until a year has passed. Here's what I've done so far.

July - mybikeandi's bike-a-thon adventure
August - Médecins Sans Frontières, designated for the crisis in Darfur, Sudan
September - ??

So, audience members, any charities you particularly like? I've ordered a copy of the American Institute of Philanthropy's guide to giving - I want my money to be used efficiently - but it includes tons and tons of top-of-the-line charities, and that's why I want your help in narrowing it down! Here are some things I have a personal interest in, but I'll gladly consider other causes too:

Civil rights
Victims of war
Breast cancer
Environmental causes, particularly as they relate to human health (e.g., ewwwwww!)

I have mixed feelings about donating to religious organizations, but will do it if they're the best game in town as far as a particular important cause goes.