I use forums for some of my link building, some of these forums usually give my site on average now in the past month and a half about 60-100 visits a day from each forum. I post in forums that are relevant to my site, and I of course post in topics that I have knowledge in. For an example, if you Google "Drop Down Menu Generator Software" do the same for Yahoo and Bing you will see my site ranked at the top in the first 4 results of Google and in 1st on yahoo and Bing.
I get these results from these top Page ranked Forums that I Search for with those Keywords. I then Insert my link pointing back to the Drop Down Menu Generator page, Not only do I have a link that I inserted I also have a link back to my main page as my Signature link.
Use this correlating Linking method to create relevant backlinks that point to each page of your site. make sure you know what you are talking about and don't spam the forums or you will be banned and you will lose that high PageRank backlink.
Here is a list of some High PageRanking forums you can sign up to and create some great backlinks.
Local Business Website Design, SEO and Internet Marketing Blog
By "Shawn Lippert"