This is just an update. I once spoke about the banning of websites here in China and so I feel it is my duty to update things.
Blogger is no longer blocked here. The unblocking happened sometime during the holidays, probably before the Olympics.
Wikipedia of course has been available for a year now. I don't know about the editing though, since I've never tried that. [me? make a Wiki entry??]
I'm not sure about Xanga though... think it's still banned.