A friend of mine is mad about apes and monkeys. We are rather partial to them too, especially after having volunteered at a gibbon sanctuary in Thailand for a month in 2010. We have also spent an afternoon amongst orangutans in the wild in Indonesia and had them wander around us in a very playful and non-threatening way.
They are fascinating creatures and spending even a short time among them really drives home how close they are to humans. Their faces show emotions, they are very curious and show a level of intelligence that you generally don't see in the animals you see day to day.
And yet we are wiping them out.

The Orangutan Land Trust (http://www.forests4orangutans.org/) works to purchase and protect land to retain the habitat of the orangutan, which in turn also helps to protect other species.