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But it's rounded, there can be a high or low PR, like with money $5.75 is more than $5.25. but the equivalent with PR would still show PR5 on the toolbar.
You can kind of tell whether a homepage is on the high or low side by interior pages. If homepage and interior are all PR5, chances are the homepage is on the high side of PR5. If interior are PR4, it's lower end PR5 for the homepage. And those could be higher or lower PR4 - you can kind of tell by pages those link to (that aren't linked to from the homepage)- whether that third tier of pages is PR4 or PR3 - or less, if there are loads of links, which will dilute the value of each link because it's divided up further.
If you have the toolbar you can see what the PR of Yahoo categories is, which would give weight to pages listed depending on how many sites are listed in the particular category.
plumsauce, to be honest I don't give much on TPR, it's not very important, and I'm pretty sure I have NOT the latest Toolbar installed. So I don't know whether there is a fancier version :)
DaveN is right, even if TPR had some value most of the time it's just false.