In your Q&A - WordPress Questions and Answers Plugin video demo, the resulting site really has a StackOverflow style. Which theme were you using? I would like to start from the same theme and customize it to my taste.
For now, I have the Q&A - WordPress Questions and Answers Plugin installed on my existing blog, but I can't see all the Q&A plugin features (like voting). I guess this is because the theme I am using is not compatible with the Q&A plugin.
One more question: Will the post from my exisiting WP blog appear like questions once the Q&A plugin will be functioning properly? Or will I have two sections in my WP site: one with normal posts, and another one with Q&As?