I just dont think its possible. What is your feeling on relevant backlinks vs. non-relevant backlinks? Have you found that it mattered in your SERPs? I can't see how "G" can determine the extent of relevancy. Sure if you leave a comment on a "model airplane" website about your "model airplane blog/store/affiliate site".... thats easy. But any further than that I cant see how then can determine what is relevant. If you have a link to your "Glue" store page on a "model boat" website is that relevant? What if you dont sell model glue? Some models use glue some dont.. is that relevant? You can extrapolate that how you want in any niche. Thoughts?