I really like this site but apart from yahoo are there any other good ask a question sites?

Find a interests/support message board for the particular question you want answered.

what about www.baidu.com and there is a chnnels named “know”,but what you need basic is that you must understand chinese

Nope, this one’s the best.

http://ask.metafilter.com/ is really good. But, it cost 5 dollars to join.

If you want to ask questions on the go, there’s http://mosio.com – it’s a text message based system, you text in a question and you’ll receive texts when people answer you.

The Linked in “Answers” section (http://www.linkedin.com/answers) is pretty good—significantly better than Yahoo answers, particularly regarding serious/business matters.

Qunu used to be an interesting concept but seems to have died a slow death…

Not really a question site, but Wikipedia has a Reference Desk that’s really good – you will always get some sort of answer there

askville.amazon.com

MyYearbook.com but it also has a lot of dating add-ons that is annoying.