All who want to receive free relevant traffic and quality permanent links from niche blogs may buy quality blog reviews, ( pesonally I use reviews broker linkfromblog.com for advertise my site on niche blogs). Such way of advertising works great with "Google Caffeine Update" (and will work in future), because it based on unique content writing. I just checked it out with new google sandbox and found positive results. P.S. I do not use any other backlinks except from blogs.