Thanks everyone. @qxlt - I don't even know how I did achieve this. I actually posted 5 links in a pr5 forum in my signature and that's pretty much all i did. But I had focused on a unique, clean design as well as unique content.
Good work. I'm hoping for similar results. Lots of high-quality unique content along with backlink work is being put into my site. Not even going to mess with low PR backlink building.