I just saw this article about Měilán's (美兰) return to China and had to mention it. If you've got a good command of Chinese and English, no infectious diseases, and a bachelor's degree or higher, you might want to consider applying.Although, I guess you'd have to be in Chengdu and know some Sìchuān huà 四川话:

"[The panda] will be taught Chinese with a Sichuan dialect because people here all speak Sichuan dialect...For example, she will be taught the phrases for going back to the cage or coming out from the dormitory."

I couldn't find the sina site that was mentioned but I did find this article that gives you the phone number to call if you want to apply.