I was looking for a Q&A complex php script for over 2 years and I still can’t decide which one is the best solution. Could you please suggest me one? I recently discovered this Famous Questions CMS and I really like it. Do you have any other ideas?
I would stay away from custom CMS'es unless you really like messing with code to make stuff actually work.
I don't know the exact way our MUO question and answer system is setup, but I know it runs on wordpress and may or may not have additional plugins. Tina will be able to tell you more.
You can do something similar with a number of plugins available, try this one:
As James pointed out MakeUseOf Answers runs on Wordpess. There are a couple of plugins that will transform WP into a Q&A site. For instance, Instant Q&A theme for WordPress, http://themeforest.net/item/instant-qa/92361