I was wondering.. Does pagerank varies across same site for different pages. I mean suppose - "wwww.any.com" has page rank of 6 and "www.any.com/1" has page rank of zero. Getting a linkback from "www.any.com/1" has what value to that of it's homepage or it's same across the whole.
Each page has its own PR but if you got a sitewide link there then the homepage Pr matters if you got link on single page then only that page's PR matters for you.
Well, nofollow links help to make your SEO campaign seem natural. It would be a bit suspicious if ALL your links are dofollow and no nofollow links. Similarly if all your backlinks are from PR9 sites, even that is suspicious. It is always good to have dofollow and nofollow links.