PageRank, is an important part of choosing blog book tour hosts. You want publicity on sites that are noticed by search engines and real people alike. But how do you check a blog's ranking?
I use PR Checker which works for all search engines. It's easy. Just type in the URL for the blog you are vetting, complete the word verification, and you get a rating between 0 and 10.
Most good blogs are rated between 3 - 5, but rarely higher. They will probably be good hosts for your blog book tour stop. Even a 2 ranked blog might be a good choice if it matches the niche market of your book. As you discover blogs you like, and when you think they will be good matches for your book, vet them at PR Checker and then add them to a running list you'll use later. A little work each day makes planning a blog book tour much easier when the time comes!