Ken Banks, one of our Collaboration Fellows, spoke today about his work doing primate conservation in Africa. Here is with a brief overview.
One of the biggest things you can do to help is avoid products with palm oil -- lots of monkeytowns (a nontechnical term) are converted into palm plantations, furthering the problem with habitat reduction.
Ken's website is kiwanja.net, and his blog is blogspot.kiwanja.net.
UPDATE: Ken forwarded me a great (but sad) article about some of the specific problems with palm farming and orangutans on Borneo.