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I'm not whining about PR being displayed, it's how I make a lot of my living, and do a lot of my work. I still think it was a mistake to ever show it, but it wasn't my mistake to make obviously; I could never have created a search engine to properly rank even 100 sites. But I think it's difficult to measure such a dynamic thing as the web when your measuring instruments are too transparent.
"Too transparent" is obviously subjective, but in a continuum from "I have no idea how Google ranks things" to "Here are the equations Google uses and how they relate to your ranking", I think the web would be a better place if they leaned toward a little more mystery.
They certainly do not. Frankly, it isn't even in the neighborhood of the ballpark. That is not what search results do, nor is what they are meant to do.
The toolbar display is just one little bit of the Google sauce we are allowed to see. I can only imagine the howling from some corners if the toolbar showed backlinks, or ranks for search terms, or a little duplicate penaltly bar, or a hidden text penalty notation, or a keyword density display, or a whois registration date, or a crosslinking numeric rating, or...
All aspects of the sauce can be manipulated, and it just so happens pagerank is one that is harder to manipulate than most (evidenced by the amount of complaints about it). Knowledge is power and I want as much data/knowledge as I can get, and I don't want to do laborious extra work to find it all out when I can just glance at a little green bar. What that bar represents will be there regardless, if you see it or not.