There is a lot of debate on that very subject! If you are speaking of toolbar ranking, it isn't a huge concern for
SEO as it is different than Google's internals and you won't really know what that is either.
So, bottom line in my opinion, keep writing using good satandard
SEO practices and your pages will show well in a search no matter what the page rank happens to be on a toolbar. My blog comes in on the first page, often in position #1, for very specific terms and I am happy with that for the blog. Now, I am working on a new site and will apply the
SEO lessons I learned to it and will see where I get to for that one.