A site's main page is the main displayer of PR correct? I remember reading an article about PR where they said PR was calculated (when 'voting' towards another person's PR) by using the main domain i.e. www.domain.com So if a page on a site linking to you is PR0 but the main PR is 6 or something, which PR gets voted towards yours?
But, that page may be zero PR because the toolbar just havent updated yet. If the link is less than a few clicks from the homepage then it'll likely get PR.
definitely shouldn't consider a page with a 0 as worthless if it's coming from a site with decent PR though- chances are it's a new page (that google's found, and hence is white not gray) and is just sitting there waiting for a pagerank update.
the grey bar means it's not even in google's index. white (or 0) often just means it's been found but hasn't been in the index long enough to have been around for an update and get some green.
hm, my mistake. I don't use IE often. looks like it'll be white with the official toolbar. still grey like old times on firefox with the pr addon though
I was under the impression grey meant that the page was banned. And I haven't seen a grey in awhile, so as an aside, the only true way to measure if a site has been banned or not I suppose would be to do a site:domain search to see if it shows up.
I think that in the old days, it was believed that a gray bar meant "not in the index", as Disgust suggests, and if it had previously had some green it was presumed that if it went to gray it meant it had been dropped from the index (banned, penalized). I'm just questioning whether that is the case today (assuming it ever was true - a lot of what people believe about Google is superstitious thinking).
originally grey meant it was not in the index- this could either be because it's a stranded page, it's brand new, because it can't be crawled (robots.txt, etc) or because it was banned. as far as I can tell it still means the same thing as always when using the firefox plugin. not sure about the official toolbar; it seems that white is the new grey.