Baidu is a highly successful Chinese search engine, basically the Chinese equivalent of Google (who is also invested in it, more details here including market share). A couple of days ago they released a wiki encyclopedia called Baidu Baike (via China Web 2.0 Review). It seems to be growing fairly quickly so this will be interesting to watch. FYI China has supposedly blocked access to Wikipedia, so Baidu Baike is the only option for many people.