I want to offer a simple page rank, back link checker service on my site. Each search only queries Google. Will it be OK with Google?
you should check the backlinks from yahoo (use their links or LD services) - also you could use the total pages indexed in google search as well to add more functionality. I would really like a working copy of this page if you are doing it in php or ASP as I would really like to add this functionality myself! thanks! MOG