What is the Chinese-language equivalent of gobase (main resource for SGF files)?
TOM qipu

http://weiqi.sports.tom.com/php/listqipu.html

Recent games, download SGF or view online with a java applet.

Flygo

http://www.flygo.net/jdqp.html

This one is a little gold mine if you know how to parse the page, old Chinese games, recent games...etc (downloadable SGF)

WeiqiOK

http://www.weiqiok.com/asp/English.asp

They have an english version. The kifu search is at the bottom of the page. (they also have tsumego, fuseki, joseki...etc.)

Here you can find a list of the players in their database.

Sina

http://duiyi.sina.com.cn/gibo/new_gibo.asp

On this page you can find recent professional games and games played on sina's weiqi server.

Eweiqi

http://www.eweiqi.com/qipu_more.asp

The Chinese portal for Tygem also has some Tygem + pro tournament kifu. (need to install an addon for IE to view)