Planet13 - 5:11 pm on Jan 14, 2012 (gmt 0)
I wouldn't trust any website for which nofollow links comprise less than 50% of the total backlinks. It is simply impossible for a website that grows its backlinks "naturally"
That is an interesting point. Although I remember Matt Cutts saying in a video a few years back that overwhelmingly there are more followable links then there are nofollow links in the web in general, I bet that now there at least a higher percentage of nofollow links than there were before (with the popularity of facebook and blogs and CMS that allow for easy content creation and have links set to nofollow by default).
I don't know whether nofollow has overtaken followable links in terms of percentage or not since Matt Cutts made that video. So while it would assume natural that a site should have a lot of nofollow links, I don't know if there is a certain "optimum ratio" of follow to nofollow links that is desirable.