I don't think there is a definitive "all about china" thread so let's just make it this thread.
Anyway, I'm also in the process of applying for a Chinese visa since I will be backpacking around China for about 2-3 weeks. Anyway, here is the requirement for filipino passport holders: http://ph.china-embassy.org/eng/lsfw/hzqz/t171818.htm
I will be grabbing a double entry visa to China since I plan on entering through Beijing and working my way around until I get into HK. Apparently, going to HK from mainland China is considered an "exit" and I need to go back to mainland China after. If that's your case, you probably want to consider getting a double entry visa.