One cool tool I use to help me know the PageRank of all the links in a specific web page is a tool called Visual Pagerank.

http://www.iwebtool.com/visual_pagerank

It adds a little PageRank bar beside the link with the familiar green bar. The more of the green bar you see, the higher the page rank.

I sometimes use this when spying on the other websites and see the PR of the links in its website.