Despite PR being slated by idiots who say 'PR useless blah blah', although it doesn't often update enough IMO, it's still a good metric to be used to find authority sites which have many links pointing to them, I know Angela's and Paul's PDF provide mostly do-follow high PR sites where you can include your link, however these are grossly overused and I wouldn't recommend it. It's a trivial task to find high PR related sites simply by searching for specific CMS's for example + keyword in G.