I have heard a lot about relevant backlinks.. Some say they can be beneficial while some say they don't give much of an advantage and are just a myth.. From my experience I have learnt that relevant backlinks do count.. I was ranked #9 for a keyword while my competitor which was an autoblog by the way was ranked #8.. He did not even had much backlinks.. Around 30 I guess.. But why was he ranked better than me? Well.. When I had a look at his backlinks they were all from relevant pages to his keyword.. So then I started harvesting blogs and forums related to my keyterm.. Built a few backlinks from them and I moved to top 3 in a week or so.. Just my 2 cents..