Apparently, the MacBook is so loaded with a toxic flame retardant called 'tetrabromobisphenol' that Greenpeace has called them "Poison Apples". Apparently Apple is trying to deal with this issue, but this problem is very typical in Chinese and Indian electronic scrap yards.
My take is that it's not surprising. You get what you pay for with cheap Chinese factories. And one of the reasons manufacturing is so cheap (other than the labor) is that you don't have to worry about any of those pesky environmental regulations that handcuff manufacturers in developed countries.
(Thanks to TUAW for picking up that story.)