I was looking at the future page rank tool at search engine engine . com and found a link to my site from a pdf file. There was a value for RK: <RK>5</RK> The RK value found in the toolbarqueries xml file is believed to be a transient value akin to Page Rank. This find leads to these possibilities: Links from documents other than web pages are spidered (not a news flash); and these documents may have Page Rank.