list of askbot sites    
  Is there a list of public askbot sites?
- answers.ros.org - Robotics Operating System Answers site
 - ask.fedoraproject.org - Fedora Linux
 - answers.dotcloud.com - dotCloud - commercial web-application hosting platform
 - asterisk-support.ru - Russian Asterisk user & developer community.
 - ask.sagemath.org - Sage is a Mathematics engine written in Python.
 - investmentqa.com - forum affiliated with moneyterms.co.uk
 - SHAZAM econometrics software user community
 - answers.gameduino.com
 - macfaq.ru
 - ask.libreoffice.org
 - questions.astrobin.com - astrophotography and astronomy.
 
Less active:
- http://www.dieselpushertalk.com
 - http://ask.gi-link.com
 - http://ask.xbase.ac.uk
 - http://help.freeavailabledomains.com/
 - http://how2occupy.com/
 - http://fifooverflow.com/
 
This list is incomplete. Please add to the list once your site is up.
Thanks.

Comments
Are there any websites that have a threaded view for the replies or does askbot support threaded replies?
@Rishabh, we will not be supporting threaded comments any time soon, unless someone decides to pay us to develop this feature.
@evegny do let me when can we discuss that
help.openerp .com is the fastest growing AskBot site with 10,000 questions and 9,716 members in only 10 months.