Patrick
that sounds very similar to an idea that you and I discused a year or so ago. It is what is needed, more information on how zoos are helping species in the wild. If you have a range of exhibits and people can choose which one they would most like to help (gold coin donation). Ideas could include - sumatran tigers funding projects that will help people and tigers live together.
Asian elephants - money for elephant retirement homes in Thailand
Indian rhinos - Nepal has/had an excellent conservaion program for these (the unrest there is causing havoc) one of there major national parks is/was overpoluated with GOAR and they were relocating individuals to other parks - successful but expensive.
Silvery gibbons - land buyback and revegetation schemes to connect isolated populations, as well as rescue of ''pet' gibbons
Any program to do with Vietnamese primates
and there would be plenty of ideas.
People could sign up for an email newsletter that will give them information about the different projects
and so on
Jai