One thing is that I really liked the layout of your site before you had the forum. If I were you, I would have both the previous version and then the forum, where people could post new questions and then you could add them to the homepage. That is just my opinion, however, and feel free to do whatever you wish with your own site. Also, for the forum, it might look cool if the divs that contain "How this works" and "Post your question" had their top left and right corners with the same radius as the larger div has, respectively.
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Also, make sure that all links that are posted have a the tag "target="_blank"" so that when users click a link they are not redirected away from the forum.