The monkey sanctuary I interned at this spring is doing a fundraiser to keep themselves running--if you have a few dollars to spare, they could really use the help! If not, you should check it out anyway for adorable pictures of baby monkeys.
Alouatta Sanctuary is the only primate rehabilitation facility in Panama that specializes in howler monkeys, though they'll take in just about anything. They use an open rehabilitation system to get orphaned monkeys out of the pet trade and back into the wild. It's truly a labor of love and every dollar counts.
Sorry for the advertisement, but I wanted to spread the word! (Which reminds me I should upload a picture of the monkey shirts I made while I was there...)