I have a rather neglected Planet driven blog aggregator - one page of links and excerpts, an about page, and a feedback form. The only incoming links I know of are from the blogroll of one of the blogs in aggregates, and from those sites that list details of various domains. It is about an year old
It has a toolbar PR of 3.
I have a personal blog that has lots of content and lots of links. Some of the links are high quality: from widely read blogs, from other sites, from people who use (or discuss) my wordpress themes and plugins, from my main site, from a few sites I have done for other people, from social news sites, etc. It has more external links to the home page than the other site has in all, and it has links from content to home page, and deep external links to the content.
It also has a toolbar PR of 3.
How can this happen? Surely lots more links = higher Toolbar PR?