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Then realized it's a whole new topic so here it is.
The toolbar is a wonderful way to get sites in the index whether it currently does or doesn't.
It can give Google a whole new meaning for PR in a whole new way.
If there are a thousand toolbar visitors to a url that vote means more than a link. People are really visiting that page. Much harder to fake. And popularity is clear as day.
Fresh pages? You want fresh? How much fresher can you get than finding pages through the toolbar?
If this isn't the case today, it should be.
I was thinking this my self when I realised that Google has a very nice opt-in panel to gauge popularity.
I think unique visitors from a specific toolbar id would be the main metric, and lets say if you did visit a particular site from the same toolbar over and over, your toolbar id is trashed for that site for being unrepresentative of normal usage.
Unless of course you uninstall your toolbar and re-install to get a new toolbar id. But seriously, doing that too often would be a) easily identified by Google and b) freakin' mindnumbing.
Google could be sitting on Alexa type data to support their crumbling PageRank metric.
Sheesh, if Alexa's data can be taken seriously then can't the same methodology be considered as the 101st Google algo?
There are a lot of applications for that data in developing regionally profiled results as well.
However, it may have been the first foray into sampling internet usage as a metric to base popularity. The PR bar could record a vote for every page you visit whether you interacted with the toolbar or not.
A much better sample.