If we're honest with ourselves, the only reason to care about another site's PR is when we are considering links. If we're trading, are we giving more than we're getting? If buying or submitting to a directory, is it worth our $ or time?
Here's how I see the issue today and for the near future.
1. Toolbar PR is outdated information, at best.
2. PR toolbar will be phased out sooner or later. Probably sooner. There will come a day when we won't know if a page has PR or not.
3. PR will still matter and while we won't know which pages will have PR we can pretty much guess about some that won't.
So which are they???
- Well, in my observation it's extremely rare to find a page that is called links.htm (or links.asp or similar) that has toolbar PR. An exception seems to be when that page has incoming links.
- Most link farm style directories within non-directory sites appear to have no PageRank.
- Pages with lists of links in a Title: Description format rarely have toolbar PR ... unless that page has some strong backlinks.
In the coming age of unrevealed PR, we will have to rely on deeper research - how well does a site do for it's target keywords, for example? Or fall back on quality and relevance. Would we be truly proud of any association with that site and is it's topic and theme highly related to our own?
Quality and Relevance. Maybe we will call that QR.