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Forum links have little value, so I would not participate just for the links.  But if you've something to say, can build your authority as a source of good knowledge. you'd get a weak sniff of link juice and possible referral traffic - and possible linking opportunities elsewhere on the back of that work through relationship building. There is some excellent stuff in here - http://moz.com/community/q/best-to-spend-marketing-budget-on-high-quality-articles-or-link-building-services that might help sculpt your attitude/approach to a strategy. A new site can dance all over the place and stable good rankings are dependent on so many factors including competition architecture content optimisation link profile authority and on...