Are you specifically asking about having your own forums and/or blogs or commenting on them?
My experience is that relevancy is key in upping your Google rank. A topic that has specific information and is found on an discussion board is almost always helpful, while blogging putting relevant information causes back-links to your blog and that itself will undoubtably help your rank (make sure your topics have permanent URL's so relevant articles can be found - sometimes called permalinks)
For my 2 cents, if you have the time do both.


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