If you don’t speak Chinese and you want to check out HiPiHi, often called China’s Second Life since it’s the largest Chinese language virtual world (and has a lot of Chinese SL users in world), you could start with Suzanne C Baskerville’s HiPiHi wiki.  She’s providing a great service by collecting information and putting out a call for translators.  It would be great to see more English speaking users in HiPiHi.