Possible Duplicate:
How to start and encourage an online community?
How do you start an on-line community QA site similar to stackoverflow?
Possible Duplicate:
How to start and encourage an online community?
How do you start an on-line community QA site similar to stackoverflow?
How do you start an on-line community QA site similar to stackoverflow?
This question was answered recently by Joel Spolsky:
We learned a long time ago that the only way to get questions answered promptly is to have a critical mass of knowledgeable users, so we have an onerous process called Area 51 where sites are proposed, discussed, and voted on. If a proposed site doesn’t have critical mass, we just won’t create it.
If you're interested in starting up a similar venture, you'll find plenty of good advice and ideas at StackOverflow Meta and at Joel's blog.
If you have web development skills you could try building your own. But for a pre-built script check out some of the clones mentioned here. https://meta.stackexchange.com/questions/2267/stack-overflow-clones