I was recently looking for an easy way to lookup the Page Rank for a given page, site or really any URL. I've seen lots of tools out that that can do it, and many of them allow you to integrate the tool into your site. But those require a lot of extra work, and they just really display the PR. I wanted to actually retrieve the value with PHP. Doing a quick search on google revealed a Google PageRank class from phpclasses.org. It seems to be pretty robust, and it looks like it will do the job!